Debian 12 Email bounce

Support
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1

What type of hardware are you using: VPS bought online
What YunoHost version are you running: 12.0.11
How are you able to access your server: The webadmin
SSH

Describe your issue

I recently migrated to debian 12
I have yunohost on a subdomain, I want to use mail on main domain.
Previously mail was working on various domains and subdomains, now none.

Diagnosis show all green/ok for all categories.
Tested in various ways, including gmail, Send a Test Email
The response is always 5.7.1 - bounced

Strangely it seems that its My server doing the bouncing: here is a message from gmail.
554 5.7.1 Service unavailable; Client host [209.85.218.41] blocked using cbl.abuseat.org; Error: open resolver; https://check.spamhaus.org/returnc/pub/158.69.169.6/

Share relevant logs or error messages

Feb 26 23:32:39 postfix/smtpd[319287]: Anonymous TLS connection established from mail.sendtestemail.com[143.244.187.129]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (3072 bits) server-digest SHA256
Feb 26 23:32:39 postfix/smtpd[319287]: NOQUEUE: reject: RCPT from mail.sendtestemail.com[143.244.187.129]: 554 5.7.1 Service unavailable; Client host [143.244.187.129] blocked using cbl.abuseat.org; Error: open resolver; https://check.spamhaus.org/returnc/pub/158.69.169.14/; from=<support@sendtestemail.com> to=<info@mydomain.com> proto=ESMTP helo=<mail.sendtestemail.com>
Feb 26 23:32:39 postfix/smtpd[319287]: disconnect from mail.sendtestemail.com[143.244.187.129] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 rset=1 quit=1 commands=6/8
1 Like
2

You have port 53 open, which means your server is an open dns resolver. Close it. You may have to wait a bit.

3

:open_mouth: trying that, thx!

4

Ok, 2 days later, same deal.

IDK, my server is the one bouncing the messages, something else is going on.

Also noticed I have 5353 open, could that impact?

5

Oh, that one should be closed too.

Mhh, you can edit /etc/postfix/main.cf and comment the line “reject_rbl_client cbl.abuseat.org,” then restart postfix

6

That seems to have fixed rejecting emails from Gmail

7

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