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E-Mail / Can't send email

« on: June 26, 2020, 06:32:43 PM »

Good day,

I hope someone can help.

I can receive email but can't send. Internal sending from one to another email on my server works though.

Have set up SPF, DKIM and DMARC and I get a green light at MX Toolbox. New emails can even be set up in a client like Thunderbird without error.

I have contacted my ISP and they initially said the SMTP port was blocked and opened by them. I tried and still nothing. Then my ISP said port 25 was still blocked and they unblocked it. But still not working.

This is the Mail Queue error message:

Queue reason:
00EBD6248E     1482 Fri Jun 26 13:54:32 

(connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c00::1a]:25: Connection timed out)
                                       
Here is the server's mail log:

Jun 26 13:54:33 mail postfix/qmgr[8042]: 871CB62373: removed
Jun 26 13:55:03 mail postfix/smtp[8378]: connect to gmail-smtp-in.l.google.com[2607:f8b0:400d:c0f::1b]:25: Connection timed out
Jun 26 13:55:33 mail postfix/smtp[8378]: connect to gmail-smtp-in.l.google.com[172.217.197.27]:25: Connection timed out
Jun 26 13:56:03 mail postfix/smtp[8378]: connect to alt1.gmail-smtp-in.l.google.com[2800:3f0:4003:c00::1b]:25: Connection timed out
Jun 26 13:56:33 mail postfix/smtp[8378]: connect to alt1.gmail-smtp-in.l.google.com[64.233.186.27]:25: Connection timed out
Jun 26 13:57:03 mail postfix/smtp[8378]: connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c00::1b]:25: Connection timed out
Jun 26 13:57:03 mail postfix/smtp[8378]: 00EBD6248E: to=, relay=none, delay=150, delays=0.06/0.03/150/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c00::1b]:25: Connection timed out)
Jun 26 13:59:33 mail postfix/smtpd[8375]: timeout after END-OF-MESSAGE from unknown[127.0.0.1]
Jun 26 13:59:33 mail postfix/smtpd[8375]: disconnect from unknown[127.0.0.1] ehlo=1 mail=1 rcpt=1 data=1 commands=4
Jun 26 14:04:30 mail clamd[7911]: SelfCheck: Database status OK.
Jun 26 14:06:41 mail postfix/qmgr[8042]: 00EBD6248E: from=, size=1482, nrcpt=1 (queue active)
Jun 26 14:07:11 mail postfix/smtp[9791]: connect to gmail-smtp-in.l.google.com[2607:f8b0:400d:c0f::1a]:25: Connection timed out
Jun 26 14:07:41 mail postfix/smtp[9791]: connect to gmail-smtp-in.l.google.com[172.217.197.27]:25: Connection timed out
Jun 26 14:08:11 mail postfix/smtp[9791]: connect to alt1.gmail-smtp-in.l.google.com[2800:3f0:4003:c00::1a]:25: Connection timed out
Jun 26 14:08:41 mail postfix/smtp[9791]: connect to alt1.gmail-smtp-in.l.google.com[64.233.186.27]:25: Connection timed out
Jun 26 14:09:11 mail postfix/smtp[9791]: connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c00::1a]:25: Connection timed out
Jun 26 14:09:11 mail postfix/smtp[9791]: 00EBD6248E: to=, relay=none, delay=879, delays=728/0.05/150/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c00::1a]:25: Connection timed out)
Jun 26 14:14:31 mail clamd[7911]: SelfCheck: Database status OK.
Jun 26 14:14:56 mail postfix/smtpd[10648]: connect from unknown[193.56.28.159]
Jun 26 14:14:59 mail postfix/smtpd[10648]: warning: unknown[193.56.28.159]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 26 14:15:05 mail postfix/smtpd[10648]: warning: unknown[193.56.28.159]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 26 14:15:15 mail postfix/smtpd[10648]: warning: unknown[193.56.28.159]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 26 14:15:25 mail postfix/smtpd[10648]: warning: unknown[193.56.28.159]: SASL LOGIN authentication failed: Connection lost to authentication server
Jun 26 14:15:25 mail postfix/smtpd[10648]: disconnect from unknown[193.56.28.159] ehlo=1 auth=0/4 rset=4 quit=1 commands=6/10

Thanks for your help.