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In my case, it shouldn't be a big problem as I am not dealing with 100s of domains. Can you point to some articles explaining this method? Is this just done at the DNS level?

I am using Spamassassin.

I found on GitHub the Plesk-Mail-LetsEcrypt script. The method proposed there is using the Subject Alternative Name (SAN) mechanism (available from Let's Encrypt). It captures all the domains and adds them using this: /usr/local/psa/bin/extension --exec letsencrypt cli.php --secure-plesk -w...

What would be the recommended way of adding support of the subdomain mail.domain.tld, so our mail clients do not receive a message saying that there is a hostname mismatch? At the moment, our Plesk server is sending the certificate for the first installed domain to the mail clients.

Thank you, Peter. I was assuming that it was the case, but I wanted to be sure. Would it be any evidence on the logs about dovecot not running / placing the files in the proper directories? What should I look for?

I am transferring users from an old server to a new one. In the old one I was using courier-imap and in the new, dovecot. I used the courier-dovecot-migrate.pl script to transform the Maildirs to dovecot. For a period of time, I have messages delivered by Postfix that never reached the proper...

I have changed my server's hostname (using this guide) because I want to avoid system messages coming from root@localhost.localdomain. The change works, but now every message sent to root is bounced: May 20 21:49:12 server postfix/smtp[30983]: 859B01008EA5: to=<root@localhost.localdomain>...