Hi guys,

I have configured my mail server (subd.main.tld) with Let’s encrypt and it’s working great.
Also configure subd.secondary.tld, when I try to access additional domain (subd.secondary.tld) it gives me SSL error stating it belongs to mail.main.tld
I have made a (subd=subdomain) A name record for both mail.main.tld and mail.secondary.tld to same IP address.
Also I added:
ADDITIONAL_SAN=subd.main.tld, subd.secondary.tld
My DNS is Cloudflare.
„main.tld” DNS settings

„secondary.tld” DNS settings

The undelivered mail reply:
This is the mail system at host ow.klaribo.eu.

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

tesztfelhasznalo@yahoo.com: host mta6.am0.yahoodns.net[67.195.204.77] said:
553 5.7.2 [TSS09] All messages from 6.7.8.9 will be permanently
deferred; Retrying will NOT succeed. See
postmaster.yahooinc.com Icon SMTP Error Codes | Sender Hub

postmaster.yahooinc.com Icon postmaster.yahooinc.com
SMTP Error Codes | Sender Hub
SMTP Error Codes
postmaster.yahooinc.compostmaster.yahooinc.compostmaster.yahooinc.com
(in reply to MAIL FROM command)

DKIM, DMARC all OK, SPF set.

Some ideas, because I’m stuck.
Thanks in advance.

Did you read the docs about a second domain and the web UI?

docs.mailcow.email Icon Advanced SSL - mailcow: dockerized documentation

docs.mailcow.email Icon docs.mailcow.email
Advanced SSL - mailcow: dockerized documentation
None
docs.mailcow.email

If you plan to use a server name that is not MAILCOW_HOSTNAME to access the mailcow UI (for example by adding mail.* to ADDITIONAL_SAN make sure to populate that name in mailcow.conf via ADDITIONAL_SERVER_NAMES.

The Yahoo website states:

A 553 or 554 SMTP error indicates an email could not be delivered due to a permanent problem. Message delivery can be permanently deferred because:
You’re trying to send a message to an invalid email address.
Your message failed authentication checks against your sending domain’s DMARC or DKIM policy.
The message contains characteristics that Yahoo won’t accept for policy reasons.
Other suspicious behavior which leads Yahoo to issue a permanent rejection for your SMTP connection.
Your IP is listed by Spamhaus. Please check with https://www.spamhaus.org.

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