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Allow to configure SRS sender classes easily

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This will allow to forward safely any email from any host, no matter how strict their SPF policy is, by setting `SRS_SENDER_CLASSES=envelope_sender,header_sender`.

@Tecnativa TT20505
This commit is contained in:
Jairo Llopis 2019-12-03 13:33:51 +00:00
parent 2bb1a753e7
commit 42348ff353
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GPG key ID: 59564BF1E22F314F
3 changed files with 22 additions and 1 deletions
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12
README.md
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@ -660,6 +660,18 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
## SRS (Sender Rewriting Scheme)
##### SRS_SENDER_CLASSES
An email has an "envelope" sender (indicating the sending server) and a
"header" sender (indicating who sent it). More strict SPF policies may require
you to replace both instead of just the envelope sender.
[More info](https://www.mybluelinux.com/what-is-email-envelope-and-email-header/).
- **envelope_sender** => Rewrite only envelope sender address
- header_sender => Rewrite only header sender (not recommended)
- envelope_sender,header_sender => Rewrite both senders
##### SRS_EXCLUDE_DOMAINS
- **empty** => Envelope sender will be rewritten for all domains

8
env-mailserver.dist
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@ -294,6 +294,14 @@ SASL_PASSWD=
# ---------------- SRS section --------------------------------------------------------------------------------------------
# -----------------------------------------------------------------------------------------------------------------------------
# envelope_sender => Rewrite only envelope sender address (default)
# header_sender => Rewrite only header sender (not recommended)
# envelope_sender,header_sender => Rewrite both senders
# An email has an "envelope" sender (indicating the sending server) and a
# "header" sender (indicating who sent it). More strict SPF policies may require
# you to replace both instead of just the envelope sender.
SRS_SENDER_CLASSES=envelope_sender
# empty => Envelope sender will be rewritten for all domains
# provide comma separated list of domains to exclude from rewriting
SRS_EXCLUDE_DOMAINS=

3
target/start-mailserver.sh
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@ -33,6 +33,7 @@ DEFAULT_VARS["POSTSCREEN_ACTION"]="${POSTSCREEN_ACTION:="enforce"}"
DEFAULT_VARS["SPOOF_PROTECTION"]="${SPOOF_PROTECTION:="0"}"
DEFAULT_VARS["TLS_LEVEL"]="${TLS_LEVEL:="modern"}"
DEFAULT_VARS["ENABLE_SRS"]="${ENABLE_SRS:="0"}"
DEFAULT_VARS["SRS_SENDER_CLASSES"]="${SRS_SENDER_CLASSES:="envelope_sender"}"
DEFAULT_VARS["REPORT_RECIPIENT"]="${REPORT_RECIPIENT:="0"}"
DEFAULT_VARS["LOGROTATE_INTERVAL"]="${LOGROTATE_INTERVAL:=${REPORT_INTERVAL:-"daily"}}"
DEFAULT_VARS["LOGWATCH_INTERVAL"]="${LOGWATCH_INTERVAL:="none"}"
@ -906,7 +907,7 @@ function _setup_postfix_aliases() {
function _setup_SRS() {
notify 'task' 'Setting up SRS'
postconf -e "sender_canonical_maps = tcp:localhost:10001"
postconf -e "sender_canonical_classes = envelope_sender"
postconf -e "sender_canonical_classes = $SRS_SENDER_CLASSES"
postconf -e "recipient_canonical_maps = tcp:localhost:10002"
postconf -e "recipient_canonical_classes = envelope_recipient,header_recipient"
}