PMG outgoing mail: connection timed out.

[dreadnaut]

Sorry this is a similar post to a lot out there. I've read them and still stuck. Not sure where to go from here.

I've been trying to get postfix mail server up and running past couple days and pointed at PMG and this morning I finally got that piece of the puzzle solved.

Now the mail is going from the server to the queue in PMG but it after a minute or so after saying it it 'queued/accepted' with a green check, it goes back to 'queued/deferred'. My internal port is 26, external is 25. I can telnet from PMG to the server and get the ESMTP message. I can

traceroute -n -T -p 26 alt2.gmail-smtp-in.l.google.com

but not

traceroute -n -T -p 25 alt2.gmail-smtp-in.l.google.com

Port 25 stops at the SmartNID/modem gateway. I cannot turn it to transparent mode like previous models.

Quantum C6500XK is the model.

I've had 4 different Quantum reps tell me that they do not have a block on port 25. I've had the SmartNID firewall turned off, but I then turned it on to explicitly allow port 25. Still same errors.

2024-03-22T14:35:32.801374-05:00 mail postfix/smtpd[10156]: connect from unknown[10.100.100.1]
2024-03-22T14:35:32.809059-05:00 mail postfix/smtpd[10156]: C5814E0B28: client=unknown[10.100.100.1]
2024-03-22T14:35:32.809972-05:00 mail postfix/cleanup[10159]: C5814E0B28: message-id=<20240322193532.B3689200042@serv1.somedomain.com>
2024-03-22T14:35:32.815216-05:00 mail postfix/smtpd[10156]: disconnect from unknown[10.100.100.1] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
2024-03-22T14:35:32.815357-05:00 mail postfix/qmgr[9920]: C5814E0B28: from=<root@somedomain.com>, size=558, nrcpt=1 (queue active)
2024-03-22T14:35:32.862925-05:00 mail pmg-smtp-filter[5572]: E0B3965FDDD84D23BA: new mail message-id=<20240322193532.B3689200042@serv1.somedomain.com>#012
2024-03-22T14:35:32.878193-05:00 mail postfix/smtpd[10164]: connect from localhost.localdomain[127.0.0.1]
2024-03-22T14:35:32.878954-05:00 mail postfix/smtpd[10164]: D691DE0B3A: client=localhost.localdomain[127.0.0.1], orig_client=unknown[10.100.100.1]
2024-03-22T14:35:32.921082-05:00 mail postfix/cleanup[10159]: D691DE0B3A: message-id=<20240322193532.B3689200042@serv1.somedomain.com>
2024-03-22T14:35:32.926828-05:00 mail postfix/qmgr[9920]: D691DE0B3A: from=<root@somedomain.com>, size=771, nrcpt=1 (queue active)
2024-03-22T14:35:32.926890-05:00 mail pmg-smtp-filter[5572]: E0B3965FDDD84D23BA: accept mail to <someemail@proton.me> (D691DE0B3A) (rule: default-accept)
2024-03-22T14:35:32.927071-05:00 mail postfix/smtpd[10164]: disconnect from localhost.localdomain[127.0.0.1] ehlo=1 xforward=1 mail=1 rcpt=1 data=1 commands=5
2024-03-22T14:35:32.929535-05:00 mail pmg-smtp-filter[5572]: E0B3965FDDD84D23BA: processing time: 0.065 seconds (0, 0.01, 0)
2024-03-22T14:35:32.929770-05:00 mail postfix/lmtp[10160]: C5814E0B28: to=<someemail@proton.me>, relay=127.0.0.1[127.0.0.1]:10023, delay=0.12, delays=0.01/0/0.04/0.07, dsn=2.5.0, status=sent (250 2.5.0 OK (E0B3965FDDD84D23BA))
2024-03-22T14:35:32.929987-05:00 mail postfix/qmgr[9920]: C5814E0B28: removed
2024-03-22T14:38:03.205015-05:00 mail postfix/smtp[10141]: D691DE0B3A: to=<someemail@proton.me>, relay=none, delay=150, delays=0.05/0/150/0, dsn=4.4.1, status=deferred (connect to mailsec.protonmail.ch[185.70.42.129]:25: Connection timed out)
2024-03-22T14:43:27.325727-05:00 mail postfix/qmgr[9920]: D691DE0B3A: from=<root@somedomain.com>, size=771, nrcpt=1 (queue active)
2024-03-22T14:45:57.640997-05:00 mail postfix/smtp[10227]: D691DE0B3A: to=<someemail@proton.me>, relay=none, delay=625, delays=474/0.01/150/0, dsn=4.4.1, status=deferred (connect to mailsec.protonmail.ch[185.205.70.129]:25: Connection timed out)

Same for gmail servers

2024-03-22T14:07:30.595686-05:00 mail postfix/error[9889]: 812F5E0B29: to=<someemail@gmail.com>, relay=none, delay=0.07, delays=0.05/0/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to alt2.gmail-smtp-in.l.google.com[172.253.62.27]:25: Connection timed out)
2024-03-22T14:08:36.270030-05:00 mail postfix/qmgr[9920]: 812F5E0B29: from=<root@somedomain.com>, size=771, nrcpt=1 (queue active)
2024-03-22T14:09:36.520917-05:00 mail postfix/smtp[9956]: 812F5E0B29: to=<someemail@gmail.com>, relay=none, delay=126, delays=66/0.01/60/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:4004:c07::1a]:25: Network is unreachable)

 

[dreadnaut]

Time	Log comp	Log subtype	Username	Firewall rule	Firewall rule name	NAT rule	NAT rule name	In interface	Out interface	Src IP	Dst IP	Src port	Dst port	protocol	Rule type

2024-03-22 15:48:03

Firewall Rule

Allowed

26

MAIL to LAN

2

Default SNAT IPv...

Port3

Port2

10.100.100.10

142.251.166.27

52149

25

TCP

I think I have eliminated the ISP as blocking. Maybe it could be traceroute issue to 25. It is being allowed through my FW.

 

[Stoiko Ivanov]

The logs simply say, that PMG cannot connect to port 25 on both protonmail server and gmail servers.
As it's really unlikely that both are down - my guess is that your ISP simply does not allow connections on port 25 from your IP
(This is not uncommon, as it is quite an effective way to prevent spam from the customer IPs)