i've add a domain on efa server, but when i try to send an email from another mail server on the same subnet, i've this error :
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Jan 10 11:58:53 mail05-levita postfix/smtp[5569]: 30E6541E6C55: to=<mariachiara.gentile@3bgroup.it>, relay=mx.3bgroup.it[185.96.217.11]:25, delay=0.37, delays=0.01/0.01/0.22/0.13, dsn=4.7.1, status=deferred (host mx.3bgroup.it[185.96.217.11] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [172.16.70.254] (in reply to RCPT TO command))
i've enabled full recursion dns and also put on sender server an entry on /etc/hosts but i've still same problem.
So i've try to contact mx.3bgroup.it by telnet on port 25 and i've this welcome message
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220 lev-mail-01.inlevita.it ESMTP Postfix
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220 proxy.levita.cloud ESMTP Postfix
185.96.217.11 is my efa server and has a right PTR.
so "Client host rejected" i think that can be caused because of this mismatching of welcome message.
Why i don't have the welcome message of efa server?
Thanks