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< li class = "md-nav__item" >
< a href = "../../../config/security/understanding-the-ports/" class = "md-nav__link" >
Understanding the Ports
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/security/ssl/" class = "md-nav__link" >
SSL/TLS
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/security/fail2ban/" class = "md-nav__link" >
Fail2Ban
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_3_5" data-md-state = "indeterminate" type = "checkbox" id = "__nav_3_5" checked >
< label class = "md-nav__link" for = "__nav_3_5" >
Troubleshooting
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Troubleshooting" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_3_5" >
< span class = "md-nav__icon md-icon" > < / span >
Troubleshooting
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../../config/troubleshooting/debugging/" class = "md-nav__link" >
Debugging
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/pop3/" class = "md-nav__link" >
Mail Delivery with POP3
< / a >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_3_7" data-md-state = "indeterminate" type = "checkbox" id = "__nav_3_7" checked >
< label class = "md-nav__link" for = "__nav_3_7" >
Advanced Configuration
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Advanced Configuration" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_3_7" >
< span class = "md-nav__icon md-icon" > < / span >
Advanced Configuration
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/optional-config/" class = "md-nav__link" >
Optional Configuration
< / a >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_3_7_2" data-md-state = "indeterminate" type = "checkbox" id = "__nav_3_7_2" checked >
< label class = "md-nav__link" for = "__nav_3_7_2" >
Maintenance
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Maintenance" data-md-level = "3" >
< label class = "md-nav__title" for = "__nav_3_7_2" >
< span class = "md-nav__icon md-icon" > < / span >
Maintenance
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/maintenance/update-and-cleanup/" class = "md-nav__link" >
Update and Cleanup
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_3_7_3" data-md-state = "indeterminate" type = "checkbox" id = "__nav_3_7_3" checked >
< label class = "md-nav__link" for = "__nav_3_7_3" >
Override the Default Configs
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Override the Default Configs" data-md-level = "3" >
< label class = "md-nav__title" for = "__nav_3_7_3" >
< span class = "md-nav__icon md-icon" > < / span >
Override the Default Configs
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/override-defaults/dovecot/" class = "md-nav__link" >
Dovecot
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/override-defaults/postfix/" class = "md-nav__link" >
Postfix
< / a >
< / li >
2021-04-01 20:45:17 +00:00
< li class = "md-nav__item" >
< a href = "../../../config/advanced/override-defaults/user-patches/" class = "md-nav__link" >
Modifications via Script
< / a >
< / li >
2021-03-28 12:40:56 +00:00
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/auth-ldap/" class = "md-nav__link" >
LDAP Authentication
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/mail-sieve/" class = "md-nav__link" >
Email Filtering with Sieve
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/mail-fetchmail/" class = "md-nav__link" >
Email Gathering with Fetchmail
< / a >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_3_7_7" data-md-state = "indeterminate" type = "checkbox" id = "__nav_3_7_7" checked >
< label class = "md-nav__link" for = "__nav_3_7_7" >
Email Forwarding
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Email Forwarding" data-md-level = "3" >
< label class = "md-nav__title" for = "__nav_3_7_7" >
< span class = "md-nav__icon md-icon" > < / span >
Email Forwarding
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/mail-forwarding/relay-hosts/" class = "md-nav__link" >
Relay Hosts
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/mail-forwarding/aws-ses/" class = "md-nav__link" >
AWS SES
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/full-text-search/" class = "md-nav__link" >
Full-Text Search
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/kubernetes/" class = "md-nav__link" >
Kubernetes
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../config/advanced/ipv6/" class = "md-nav__link" >
IPv6
< / a >
< / li >
< / ul >
< / nav >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_4" type = "checkbox" id = "__nav_4" checked >
< label class = "md-nav__link" for = "__nav_4" >
Examples
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Examples" data-md-level = "1" >
< label class = "md-nav__title" for = "__nav_4" >
< span class = "md-nav__icon md-icon" > < / span >
Examples
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_4_1" type = "checkbox" id = "__nav_4_1" checked >
< label class = "md-nav__link" for = "__nav_4_1" >
Tutorials
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Tutorials" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_4_1" >
< span class = "md-nav__icon md-icon" > < / span >
Tutorials
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../basic-installation/" class = "md-nav__link" >
Basic Installation
< / a >
< / li >
< li class = "md-nav__item md-nav__item--active" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "toc" type = "checkbox" id = "__toc" >
< label class = "md-nav__link md-nav__link--active" for = "__toc" >
Mailserver behind Proxy
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
Mailserver behind Proxy
< / a >
< nav class = "md-nav md-nav--secondary" aria-label = "Table of contents" >
< label class = "md-nav__title" for = "__toc" >
< span class = "md-nav__icon md-icon" > < / span >
Table of contents
< / label >
< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#using-docker-mailserver-behind-a-proxy" class = "md-nav__link" >
Using docker-mailserver behind a Proxy
< / a >
< nav class = "md-nav" aria-label = "Using docker-mailserver behind a Proxy" >
< ul class = "md-nav__list" >
< li class = "md-nav__item" >
< a href = "#information" class = "md-nav__link" >
Information
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configuration-of-the-used-proxy-software" class = "md-nav__link" >
Configuration of the used Proxy Software
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configuration-of-the-backend-dovecot-and-postfix" class = "md-nav__link" >
Configuration of the Backend (dovecot and postfix)
< / a >
< / li >
< / ul >
< / nav >
< / li >
< / ul >
< / nav >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_4_2" data-md-state = "indeterminate" type = "checkbox" id = "__nav_4_2" checked >
< label class = "md-nav__link" for = "__nav_4_2" >
Use Cases
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Use Cases" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_4_2" >
< span class = "md-nav__icon md-icon" > < / span >
Use Cases
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../uses-cases/forward-only-mailserver-with-ldap-authentication/" class = "md-nav__link" >
Forward-Only Mailserver with LDAP
< / a >
< / li >
< / ul >
< / nav >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "../../../faq/" class = "md-nav__link" >
FAQ
< / a >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_6" data-md-state = "indeterminate" type = "checkbox" id = "__nav_6" checked >
< label class = "md-nav__link" for = "__nav_6" >
Contributing
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Contributing" data-md-level = "1" >
< label class = "md-nav__title" for = "__nav_6" >
< span class = "md-nav__icon md-icon" > < / span >
Contributing
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../../contributing/issues-and-pull-requests/" class = "md-nav__link" >
Issues and Pull Requests
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../contributing/coding-style/" class = "md-nav__link" >
Coding Style
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../contributing/tests/" class = "md-nav__link" >
Tests
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../../contributing/documentation/" class = "md-nav__link" >
Documentation
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "https://hub.docker.com/repository/docker/mailserver/docker-mailserver" class = "md-nav__link" >
DockerHub
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "https://github.com/orgs/docker-mailserver/packages/container/package/docker-mailserver" class = "md-nav__link" >
GHCR
< / a >
< / li >
< / ul >
< / nav >
< / div >
< / div >
< / div >
< div class = "md-sidebar md-sidebar--secondary" data-md-component = "sidebar" data-md-type = "toc" >
< div class = "md-sidebar__scrollwrap" >
< div class = "md-sidebar__inner" >
< nav class = "md-nav md-nav--secondary" aria-label = "Table of contents" >
< label class = "md-nav__title" for = "__toc" >
< span class = "md-nav__icon md-icon" > < / span >
Table of contents
< / label >
< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#using-docker-mailserver-behind-a-proxy" class = "md-nav__link" >
Using docker-mailserver behind a Proxy
< / a >
< nav class = "md-nav" aria-label = "Using docker-mailserver behind a Proxy" >
< ul class = "md-nav__list" >
< li class = "md-nav__item" >
< a href = "#information" class = "md-nav__link" >
Information
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configuration-of-the-used-proxy-software" class = "md-nav__link" >
Configuration of the used Proxy Software
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "#configuration-of-the-backend-dovecot-and-postfix" class = "md-nav__link" >
Configuration of the Backend (dovecot and postfix)
< / a >
< / li >
< / ul >
< / nav >
< / li >
< / ul >
< / nav >
< / div >
< / div >
< / div >
< div class = "md-content" data-md-component = "content" >
< article class = "md-content__inner md-typeset" >
< a href = "https://github.com/docker-mailserver/docker-mailserver/edit/master/docs/content/examples/tutorials/mailserver-behind-proxy.md" title = "Edit this page" class = "md-content__button md-icon" >
< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z" / > < / svg >
< / a >
< h1 > Mailserver behind Proxy< / h1 >
< h2 id = "using-docker-mailserver-behind-a-proxy" > < a class = "toclink" href = "#using-docker-mailserver-behind-a-proxy" > Using < code > docker-mailserver< / code > behind a Proxy< / a > < / h2 >
< h3 id = "information" > < a class = "toclink" href = "#information" > Information< / a > < / h3 >
< p > If you are hiding your container behind a proxy service you might have discovered that the proxied requests from now on contain the proxy IP as the request origin. Whilst this behavior is technical correct it produces certain problems on the containers behind the proxy as they cannot distinguish the real origin of the requests anymore.< / p >
< p > To solve this problem on TCP connections we can make use of the < a href = "https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt" > proxy protocol< / a > . Compared to other workarounds that exist (< code > X-Forwarded-For< / code > which only works for HTTP requests or < code > Tproxy< / code > that requires you to recompile your kernel) the proxy protocol:< / p >
< ul >
< li > It is protocol agnostic (can work with any layer 7 protocols, even when encrypted).< / li >
< li > It does not require any infrastructure changes.< / li >
< li > NAT-ing firewalls have no impact it.< / li >
< li > It is scalable.< / li >
< / ul >
< p > There is only one condition: < strong > both endpoints< / strong > of the connection MUST be compatible with proxy protocol.< / p >
< p > Luckily < code > dovecot< / code > and < code > postfix< / code > are both Proxy-Protocol ready softwares so it depends only on your used reverse-proxy / loadbalancer.< / p >
< h3 id = "configuration-of-the-used-proxy-software" > < a class = "toclink" href = "#configuration-of-the-used-proxy-software" > Configuration of the used Proxy Software< / a > < / h3 >
< p > The configuration depends on the used proxy system. I will provide the configuration examples of < a href = "https://traefik.io/" > traefik v2< / a > using IMAP and SMTP with implicit TLS.< / p >
< p > Feel free to add your configuration if you achived the same goal using different proxy software below:< / p >
< details > < summary > Traefik v2< / summary > < p > Truncated configuration of traefik itself:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > version< / span > < span class = "p" > :< / span > < span class = "s" > ' 3.7' < / span >
< span class = "nt" > services< / span > < span class = "p" > :< / span >
< span class = "nt" > reverse-proxy< / span > < span class = "p" > :< / span >
< span class = "nt" > image< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > traefik:v2.4< / span >
< span class = "nt" > container_name< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > docker-traefik< / span >
< span class = "nt" > restart< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > always< / span >
< span class = "nt" > command< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --providers.docker" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --providers.docker.exposedbydefault=false" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --providers.docker.network=proxy" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --entrypoints.web.address=:80" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --entryPoints.websecure.address=:443" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --entryPoints.smtp.address=:25" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --entryPoints.smtp-ssl.address=:465" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --entryPoints.imap-ssl.address=:993" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " --entryPoints.sieve.address=:4190" < / span >
< span class = "nt" > ports< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " 25:25" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " 465:465" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " 993:993" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " 4190:4190" < / span >
< span class = "p p-Indicator" > [< / span > < span class = "nv" > ...< / span > < span class = "p p-Indicator" > ]< / span >
< / code > < / pre > < / div >
< p > Truncated list of neccessary labels on the mailserver container:< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "nt" > version< / span > < span class = "p" > :< / span > < span class = "s" > ' 2' < / span >
< span class = "nt" > services< / span > < span class = "p" > :< / span >
< span class = "nt" > mail< / span > < span class = "p" > :< / span >
< span class = "nt" > image< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > mailserver/docker-mailserver:release-v7.2.0< / span >
< span class = "nt" > restart< / span > < span class = "p" > :< / span > < span class = "l l-Scalar l-Scalar-Plain" > always< / span >
< span class = "nt" > networks< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "l l-Scalar l-Scalar-Plain" > proxy< / span >
< span class = "nt" > labels< / span > < span class = "p" > :< / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.enable=true" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.smtp.rule=HostSNI(`*`)" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.smtp.entrypoints=smtp" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.smtp.service=smtp" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.services.smtp.loadbalancer.server.port=25" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.services.smtp.loadbalancer.proxyProtocol.version=1" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.smtp-ssl.rule=HostSNI(`*`)" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.smtp-ssl.entrypoints=smtp-ssl" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.smtp-ssl.service=smtp-ssl" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.services.smtp-ssl.loadbalancer.server.port=465" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.services.smtp-ssl.loadbalancer.proxyProtocol.version=1" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.imap-ssl.rule=HostSNI(`*`)" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.imap-ssl.entrypoints=imap-ssl" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.imap-ssl.service=imap-ssl" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.services.imap-ssl.loadbalancer.server.port=10993" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.services.imap-ssl.loadbalancer.proxyProtocol.version=2" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.sieve.rule=HostSNI(`*`)" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.sieve.entrypoints=sieve" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.routers.sieve.service=sieve" < / span >
< span class = "p p-Indicator" > -< / span > < span class = "s" > " traefik.tcp.services.sieve.loadbalancer.server.port=4190" < / span >
< span class = "p p-Indicator" > [< / span > < span class = "nv" > ...< / span > < span class = "p p-Indicator" > ]< / span >
< / code > < / pre > < / div >
< p > Keep in mind that it is neccessary to use port < code > 10993< / code > here. More information below at < code > dovecot< / code > configuration.< / p >
< / details >
< h3 id = "configuration-of-the-backend-dovecot-and-postfix" > < a class = "toclink" href = "#configuration-of-the-backend-dovecot-and-postfix" > Configuration of the Backend (< code > dovecot< / code > and < code > postfix< / code > )< / a > < / h3 >
< p > The following changes can be achived completely by adding the content to the appropriate files by using the projects < a href = "../../../config/advanced/optional-config/" > function to overwrite config files< / a > .< / p >
< p > Changes for < code > postfix< / code > can be applied by adding the following content to < code > config/postfix-main.cf< / code > :< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > postscreen_upstream_proxy_protocol< / span > < span class = "o" > =< / span > < span class = "s" > haproxy< / span >
< / code > < / pre > < / div >
< p > and to < code > config/postfix-master.cf< / code > :< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > submission/inet/smtpd_upstream_proxy_protocol< / span > < span class = "o" > =< / span > < span class = "s" > haproxy< / span >
< span class = "na" > smtps/inet/smtpd_upstream_proxy_protocol< / span > < span class = "o" > =< / span > < span class = "s" > haproxy< / span >
< / code > < / pre > < / div >
< p > Changes for < code > dovecot< / code > can be applied by adding the following content to < code > config/dovecot.cf< / code > :< / p >
< div class = "highlight" > < pre > < span > < / span > < code > < span class = "na" > haproxy_trusted_networks< / span > < span class = "o" > =< / span > < span class = "s" > < your-proxy-ip> , < optional-cidr-notation> < / span >
< span class = "na" > haproxy_timeout< / span > < span class = "o" > =< / span > < span class = "s" > 3 secs< / span >
< span class = "na" > service imap-login {< / span >
< span class = "na" > inet_listener imaps {< / span >
< span class = "na" > haproxy< / span > < span class = "o" > =< / span > < span class = "s" > yes< / span >
< span class = "na" > ssl< / span > < span class = "o" > =< / span > < span class = "s" > yes< / span >
< span class = "na" > port< / span > < span class = "o" > =< / span > < span class = "s" > 10993< / span >
< span class = "na" > }< / span >
< span class = "na" > }< / span >
< / code > < / pre > < / div >
< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
< p > Port < code > 10993< / code > is used here to avoid conflicts with internal systems like < code > postscreen< / code > and < code > amavis< / code > as they will exchange messages on the default port and obviously have a different origin then compared to the proxy.< / p >
< / div >
< / article >
< / div >
< / div >
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