mirror of
https://github.com/docker-mailserver/docker-mailserver.git
synced 2024-01-19 02:48:50 +00:00
21c218ac68
* remove DMS_DEBUG from tests * remove DMS_DEBUG from doc and scripts * updated issue template * re-add description about removal of DMS_DEBUG
66 lines
2.6 KiB
Markdown
66 lines
2.6 KiB
Markdown
---
|
|
title: 'Troubleshooting | Debugging'
|
|
---
|
|
|
|
!!! info "Contributions Welcome!"
|
|
Please contribute your solutions to help the community :heart:
|
|
|
|
## Enable Verbose Debugging Output
|
|
|
|
You may find it useful to set [`LOG_LEVEL`][docs-environment-log-level] environment variable.
|
|
|
|
## Invalid Username or Password
|
|
|
|
1. Shell into the container:
|
|
|
|
```sh
|
|
docker exec -it <my-container> bash
|
|
```
|
|
|
|
2. Check log files in `/var/log/mail` could not find any mention of incorrect logins here neither in the dovecot logs.
|
|
|
|
3. Check the supervisors logs in `/var/log/supervisor`. You can find the logs for startup of fetchmail, postfix and others here - they might indicate problems during startup.
|
|
|
|
4. Make sure you set your hostname to `mail` or whatever you specified in your `docker-compose.yml` file or else your FQDN will be wrong.
|
|
|
|
## Installation Errors
|
|
|
|
During setup, if you get errors trying to edit files inside of the container, you likely need to install `vi`:
|
|
|
|
```sh
|
|
sudo su
|
|
docker exec -it <my-container> apt-get install -y vim
|
|
```
|
|
|
|
## Testing Connection
|
|
|
|
I spent HOURS trying to debug "Connection Refused" and "Connection closed by foreign host" errors when trying to use telnet to troubleshoot my connection. I was also trying to connect from my email client (macOS mail) around the same time. Telnet had also worked earlier, so I was extremely confused as to why it suddenly stopped working. I stumbled upon `fail2ban.log` in my container. In short, when trying to get my macOS client working, I exceeded the number of failed login attempts and fail2ban put dovecot and postfix in jail! I got around it by whitelisting my ipaddresses (my ec2 instance and my local computer)
|
|
|
|
```sh
|
|
sudo su
|
|
docker exec -it mailserver bash
|
|
cd /var/log
|
|
cat fail2ban.log | grep dovecot
|
|
|
|
# Whitelist IP addresses:
|
|
fail2ban-client set dovecot addignoreip <server ip> # Server
|
|
fail2ban-client set postfix addignoreip <server ip>
|
|
fail2ban-client set dovecot addignoreip <client ip> # Client
|
|
fail2ban-client set postfix addignoreip <client ip>
|
|
|
|
# This will delete the jails entirely - nuclear option
|
|
fail2ban-client stop dovecot
|
|
fail2ban-client stop postfix
|
|
```
|
|
|
|
## Sent email is never received
|
|
|
|
Some hosting provides have a stealth block on port 25. Make sure to check with your hosting provider that traffic on port 25 is allowed
|
|
|
|
Common hosting providers known to have this issue:
|
|
|
|
- [Azure](https://docs.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity)
|
|
- [AWS EC2](https://aws.amazon.com/premiumsupport/knowledge-center/ec2-port-25-throttle/)
|
|
|
|
[docs-environment-log-level]: ../environment.md#log_level
|