Only able to send email internal.

mrEckendonk

Hello there,

I hope someone can pinpoint me in the correct direction.
I have 40 mailboxes, and 3 servers, 2 with mail function. Port 25 works

I can only send emails to emails created on the server. I have one account on ZOHO, where I created the mailbox first on the cluster and disabled it. Those emails send to any of the zoho accounts I can receive, but to an gmail account I can't. Sending from a gmail account works, I receive the mail.

I removed the csfence but that didn't make any difference, cpfence --uninstall

Here is a part of the logs

2025-02-26T04:21:19.968557+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326084><uCyTOb+WvmfE+QQANQxitg>: Error: open(/etc/dovecot/spam-global.svbin.mta91-usa-border.326084.f7d1db7d6415997b) failed: Read-only file system 2025-02-26T04:21:19.968730+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326084><uCyTOb+WvmfE+QQANQxitg>: Error: sieve: binary /etc/dovecot/spam-global.svbin: save: failed to create temporary file: open(/etc/dovecot/spam-global.svbin.) failed: Read-only file system 2025-02-26T04:21:19.976830+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326084><uCyTOb+WvmfE+QQANQxitg>: sieve: msgid=<20250226042119.E1E5E82805@mta91-usa-border.corecloudconnect.com>: stored mail into mailbox 'INBOX' 2025-02-26T04:21:19.977629+00:00 mta91-usa-border dovecot: lmtp(326084): Disconnect from local: Logged out (state=READY) 2025-02-26T04:21:19.978113+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326083><R00iOb+WvmfD+QQANQxitg>: sieve: msgid=<20250226042119.E0FA782807@mta91-usa-border.corecloudconnect.com>: stored mail into mailbox 'INBOX' 2025-02-26T04:21:19.978187+00:00 mta91-usa-border dovecot: lmtp(326083): Disconnect from local: Logged out (state=READY) 2025-02-26T04:21:22.180126+00:00 mta91-usa-border dovecot: lmtp(326083): Connect from local 2025-02-26T04:21:22.182745+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326083><eM+tCsKWvmfD+QQANQxitg>: Error: open(/etc/dovecot/spam-global.svbin.mta91-usa-border.326083.e909dc2b510a3096) failed: Read-only file system 2025-02-26T04:21:22.182856+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326083><eM+tCsKWvmfD+QQANQxitg>: Error: sieve: binary /etc/dovecot/spam-global.svbin: save: failed to create temporary file: open(/etc/dovecot/spam-global.svbin.) failed: Read-only file system 2025-02-26T04:21:22.193616+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326083><eM+tCsKWvmfD+QQANQxitg>: sieve: msgid=<20250226042119.E56F0A361D@mta910-hel-border.corecloudconnect.com>: stored mail into mailbox 'INBOX' 2025-02-26T04:21:22.194306+00:00 mta91-usa-border dovecot: lmtp(326083): Disconnect from local: Logged out (state=READY) 2025-02-26T04:21:57.395017+00:00 mta91-usa-border dovecot: lmtp(326084): Connect from local 2025-02-26T04:21:57.397118+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326084><+NZ9F+WWvmfE+QQANQxitg>: Error: open(/etc/dovecot/spam-global.svbin.mta91-usa-border.326084.c19a7cc76c1baf9f) failed: Read-only file system 2025-02-26T04:21:57.397252+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326084><+NZ9F+WWvmfE+QQANQxitg>: Error: sieve: binary /etc/dovecot/spam-global.svbin: save: failed to create temporary file: open(/etc/dovecot/spam-global.svbin.) failed: Read-only file system 2025-02-26T04:21:57.409030+00:00 mta91-usa-border dovecot: lmtp(mike.e@xoommit.com)<326084><+NZ9F+WWvmfE+QQANQxitg>: sieve: msgid=<20250226042155.C4106A361D@mta910-hel-border.corecloudconnect.com>: stored mail into mailbox 'INBOX' 2025-02-26T04:21:57.409771+00:00 mta91-usa-border dovecot: lmtp(326084): Disconnect from local: Logged out (state=READY)

Kosta

Check if this can help I’ve seen it on other discussion…

In the morning I discovered we were NOT RECEIVING emails from anyone outside of our cluster.
(ie. @gmail.com > couldnt send to my email)
As per support recommendation:

/var/spool/postfix/etc/resolv.conf

Updated to use: 8.8.8.8
rather than the systemd-resolved IP
postfix stop; postfix start
Emails are now operating just fine.

mrEckendonk

I receive emails outside the cluster, I also posted the wrong log files, new to postfix as I used EXIM in the past.

My DKIM, SPF all are fine

Here are the correct log files:

eb 26 04:42:23 mta91-usa-border postfix/smtps/smtpd[326363]: 3625B82800: client=unknown[104.28.207.196], sasl_method=LOGIN, sasl_username=mike.e@xoommit.com Feb 26 04:42:23 mta91-usa-border postfix/cleanup[326366]: 3625B82800: message-id=<aa9dfa3d276b4253e126333bdf291d24fa28fec0.camel@xoommit.com> Feb 26 04:42:24 mta91-usa-border postfix/qmgr[316965]: 3625B82800: from=<mike.e@xoommit.com>, size=5479, nrcpt=2 (queue active) Feb 26 04:42:24 mta91-usa-border postfix/lmtp[326368]: 3625B82800: to=<hello@xoommit.com>, relay=mta91-usa-border.corecloudconnect.com[dovecot-lmtp], delay=1.2, delays=1.1/0.01/0.01/0.01, dsn=2.0.0, status=sent (250 2.0.0 <hello@xoommit.com> zO1vDbCbvmfh+gQANQxitg Saved) Feb 26 04:42:24 mta91-usa-border postfix/smtps/smtpd[326363]: disconnect from unknown[104.28.207.196] ehlo=1 auth=1 mail=1 rcpt=2 data=1 quit=1 commands=7 Feb 26 04:42:24 mta91-usa-border postfix/smtp[326367]: 3625B82800: to=<mvaneckendonk@gmail.com>, relay=gmail-smtp-in.l.google.com[172.253.62.27]:25, delay=1.9, delays=1.1/0.01/0.25/0.49, dsn=2.0.0, status=sent (250 2.0.0 OK 1740544944 d75a77b69052e-47377e30b08si30777521cf.168 - gsmtp) Feb 26 04:42:24 mta91-usa-border postfix/cleanup[326366]: EA5E382805: message-id=<20250226044224.EA5E382805@mta91-usa-border.corecloudconnect.com> Feb 26 04:42:24 mta91-usa-border postfix/bounce[326370]: 3625B82800: sender delivery status notification: EA5E382805 Feb 26 04:42:24 mta91-usa-border postfix/qmgr[316965]: EA5E382805: from=<>, size=4468, nrcpt=1 (queue active) Feb 26 04:42:24 mta91-usa-border postfix/qmgr[316965]: 3625B82800: removed Feb 26 04:42:24 mta91-usa-border postfix/lmtp[326368]: EA5E382805: to=<mike.e@xoommit.com>, relay=mta91-usa-border.corecloudconnect.com[dovecot-lmtp], delay=0.02, delays=0/0/0/0.02, dsn=2.0.0, status=sent (250 2.0.0 <mike.e@xoommit.com> 8Mh2ObCbvmfh+gQANQxitg Saved) Feb 26 04:42:24 mta91-usa-border postfix/qmgr[316965]: EA5E382805: removed

rdbf

mrEckendonk status=sent (250 2.0.0 OK 1740544944 d75a77b69052e-47377e30b08si30777521cf.168 - gsmtp)

Based on this I would have said they must have arrived, as gmail accepted it here.

Kosta

I am new to everything, but is ipv6 and PTR records set correctly?

mrEckendonk

Kosta

Yes, all fine. DKIM, SPF, PTR DMARC.

Suddenly it worked, not changing anything.

mrEckendonk

This drove me nuts for hours. Suddenly the mails start to drop in.

Kosta

mrEckendonk strange, maybe something with the DNS