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SASL authorisation and hostname to access the server

sg flag

I have a working postfix mail server. It is registered under two DNS names: mail.xxxx.de and xxxx.no-ip.org. I use SASL via dovecot for relay authorisation. It works flawless when the client uses the latter name to access the mail server. However, it fails when the first is used.

Aug 06 14:53:37 mail postfix/smtpd[73670]: NOQUEUE: reject: RCPT from unknown[xx.xx.xx.xx]: 554 5.7.1 [email protected]: Relay access denied; from=<[email protected] [email protected] proto=ESMTP helo=<smtpclient.apple>

I am unable to identify on which parameter it depends which one works.

I would like to achieve that both options are working.

tsc_chazz avatar
vn flag
This is sending mail? Dovecot doesn't generally apply when sending, it handles IMAP/POP. Look at how you have Postfix's SMTPAuth set up.
jp flag
@tsc_chazz: Dovecot provides SASL for Postfix; see [Postfix SASL Howto](https://www.postfix.org/SASL_README.html) & [Postfix and Dovecot SASL](https://doc.dovecot.org/configuration_manual/howto/postfix_and_dovecot_sasl/).
jp flag
But this question still needs a lot more details including the Postfix's configuration.
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