554 5.7.1 : Relay access denied centos postfix

 

Based on the Postfix documentation, setting mynetworks = all doesn’t appear to be valid, and if you specifically set mynetworks to something, then mynetworks_style is ignored.

Reset mynetworks back to its default value if you want to use mynetworks_style=host, or explicitly set mynetworks to reflect where mail is being sent from (usually localhost and your local subnet). For example:

mynetworks = 127.0.0.0/8 192.168.1.0/24
mynetworks_style = subnet

Based on the Postfix documentation, setting mynetworks = all doesn’t appear to be valid, and if you specifically set mynetworks to something, then mynetworks_style is ignored.

Reset mynetworks back to its default value if you want to use mynetworks_style=host, or explicitly set mynetworks to reflect where mail is being sent from (usually localhost and your local subnet). For example:

mynetworks = 127.0.0.0/8 192.168.1.0/24
mynetworks_style = subnet

How to resolve and prevent 554 5.7.1 : Relay access denied email errors in Linux and Windows mail servers

 

When a mail user tries to send a mail, and gets a bounce.
When mails from a remote domain is rejected by the server, and mail users report it to the server owner.
In either case, we’ve seen the error recorded in mail server logs. It looks something like this:

Jan 23 03:10:57 mysev postfix/smtpd[15921]: NOQUEUE: reject: RCPT from mail-wg0-f53.google.com[74.125.82.53]:
554 5.7.1 <user1@vdomain1.com>: Relay access denied; from=<sender+caf_=sender=sender@gmail.com> to=<user1@domain1.com> proto=ESMTP helo=<mail-wg0-f53.google.com>

1. User authentication system could be broken
All modern mail servers have a way to authenticate a user before it accepts a mail to be sent. So, if we notice ALL of the mail server users getting this error, we immediately check the user authentication settings of mail server.
For example, in Postfix mail server, the below setting enables SMTP authentication. If this is disabled in the configuration file, all the users will receive “554 5.7.1 : Relay access denied“.
smtpd_recipient_restrictions = permit_sasl_authenticated

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