lost connection after CONNECT

[RangersMS]

After installing it on-prem Simple Login isn't able to send via Postfix. It can connect to it but after Connect connection seems to be dropped by Simple Login.

lost connection after CONNECT from unknown[169.254.1.3]

FYI: I've changed the docker ip network from the documentation to a custom net (169.254.0.0/16). This change was also done in the main.cf of Postfix for my networks.
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 169.254.0.0/16

I followed the troubleshooting guide A1 and A2. Both test were successful. I received the test mail from swaks and I was able to connect from the Simple Login container to the postfix.

Dec 29 17:08:20 mail-relay01 postfix/smtpd[13807]: connect from keeper-us-east-1d.mxtoolbox.com[18.209.86.113]
Dec 29 17:08:20 mail-relay01 postfix/smtpd[13807]: NOQUEUE: reject: RCPT from keeper-us-east-1d.mxtoolbox.com[18.209.86.113]: 554 5.7.1 [email protected]: Relay access denied; from=[email protected] to=[email protected] proto=ESMTP helo=<keeper-us-east-1d.mxtoolbox.com>
Dec 29 17:08:20 mail-relay01 postfix/smtpd[13807]: using backwards-compatible default setting smtpd_relay_before_recipient_restrictions=no to reject recipient "[email protected]" from client "keeper-us-east-1d.mxtoolbox.com[18.209.86.113]"
Dec 29 17:08:21 mail-relay01 postfix/smtpd[13807]: disconnect from keeper-us-east-1d.mxtoolbox.com[18.209.86.113] ehlo=1 mail=1 rcpt=0/1 quit=1 commands=3/4
Dec 29 17:08:53 mail-relay01 postfix/smtpd[13807]: connect from unknown[169.254.1.3]
Dec 29 17:08:53 mail-relay01 postfix/smtpd[13807]: lost connection after CONNECT from unknown[169.254.1.3]
Dec 29 17:08:53 mail-relay01 postfix/smtpd[13807]: disconnect from unknown[169.254.1.3] commands=0/0
Dec 29 17:12:13 mail-relay01 postfix/anvil[13810]: statistics: max connection rate 1/60s for (smtp:18.209.86.113) at Dec 29 17:08:20
Dec 29 17:12:13 mail-relay01 postfix/anvil[13810]: statistics: max connection count 1 for (smtp:18.209.86.113) at Dec 29 17:08:20
Dec 29 17:12:13 mail-relay01 postfix/anvil[13810]: statistics: max cache size 1 at Dec 29 17:08:20
Dec 29 17:39:05 mail-relay01 postfix/smtpd[14974]: connect from unknown[169.254.1.3]
Dec 29 17:39:33 mail-relay01 postfix/smtpd[14974]: disconnect from unknown[169.254.1.3] quit=1 unknown=0/1 commands=1/2

The Simple Login containers don't create any log entry at that time. The only logs are from the start. After that no log entry is generated.

PS: The first connection from mxtoolbox.com was to verify I don't have an open relay. This also verifies that Postfix is connected to the PostgreSQL. At the beginning I had issues connecting to the db because of special characters in the password and then Postfix created the following log entry

Dec 29 13:51:22 mail-relay01 postfix/smtpd[5827]: connect from keeper-us-east-1d.mxtoolbox.com[18.209.86.113]
Dec 29 13:51:22 mail-relay01 postfix/trivial-rewrite[5831]: warning: connect to pgsql server localhost: connection to server at "localhost" (::1), port 5432 failed: Connection refused??Is the server running on that host and accepting TCP/IP connections??connection to server at "localhost" (127.0.0.1), port 5432 failed: FATAL: password authentication failed for user "'simplelogin'"?
Dec 29 13:51:22 mail-relay01 postfix/trivial-rewrite[5831]: warning: relay_domains: pgsql:/etc/postfix/pgsql-relay-domains.cf: table lookup problem
Dec 29 13:51:22 mail-relay01 postfix/trivial-rewrite[5831]: warning: relay_domains lookup failure
Dec 29 13:51:22 mail-relay01 postfix/trivial-rewrite[5831]: warning: relay_domains: pgsql:/etc/postfix/pgsql-relay-domains.cf: table lookup problem
Dec 29 13:51:22 mail-relay01 postfix/trivial-rewrite[5831]: warning: relay_domains lookup failure
Dec 29 13:51:22 mail-relay01 postfix/smtpd[5827]: NOQUEUE: reject: RCPT from keeper-us-east-1d.mxtoolbox.com[18.209.86.113]: 451 4.3.0 [email protected]: Temporary lookup failure; from=[email protected] to=[email protected] proto=ESMTP helo=<keeper-us-east-1d.mxtoolbox.com>
Dec 29 13:51:22 mail-relay01 postfix/smtpd[5827]: disconnect from keeper-us-east-1d.mxtoolbox.com[18.209.86.113] ehlo=1 mail=1 rcpt=0/1 quit=1 commands=3/4
Dec 29 13:51:53 mail-relay01 postfix/smtpd[5827]: connect from keeper-us-east-1d.mxtoolbox.com[18.209.86.113]
Dec 29 13:51:54 mail-relay01 postfix/smtpd[5827]: NOQUEUE: reject: RCPT from keeper-us-east-1d.mxtoolbox.com[18.209.86.113]: 451 4.3.0 [email protected]: Temporary lookup failure; from=[email protected] to=[email protected] proto=ESMTP helo=<keeper-us-east-1d.mxtoolbox.com>
Dec 29 13:51:54 mail-relay01 postfix/smtpd[5827]: disconnect from keeper-us-east-1d.mxtoolbox.com[18.209.86.113] ehlo=1 mail=1 rcpt=0/1 quit=1 commands=3/4

So I can conclude that Postfix now has a connection to the PostgreSQL db.

[nguyenkims]

I've changed the docker ip network from the documentation to a custom net (169.254.0.0/16)

In the simplelogin.env file, the POSTFIX_SERVER is set to 10.0.0.1, have you updated this value?

If the A2 test is successful, that means SimpleLogin containers can send emails to Postfix.

[RangersMS]

Thank you very much for looking into it!

Yes I have changed that config
POSTFIX_SERVER=host.docker.internal
Have used the hostname host.docker.internal which always refers to the IP of the Docker host as described in this Docker Docs and this Medium articel.

I can see a connection from the SimpleLogin App when I want to register my user and SimpleLogin tries to send a confirmation mail. It's just that from there on nothing happens and the connection get's disconnected.

Dec 29 17:39:05 mail-relay01 postfix/smtpd[14974]: connect from unknown[169.254.1.3]
Dec 29 17:39:33 mail-relay01 postfix/smtpd[14974]: disconnect from unknown[169.254.1.3] quit=1 unknown=0/1 commands=1/2

[nguyenkims]

Can you try with the numbered IP address? I suspect that SL containers aren't able to connect to Postfix which is running on the host.