Symptoms
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Emails sent through a mailing list (mailman) to external mailboxes (Gmail, Outlook, Yahoo!, etc.) are not received
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One of the following error messages appears in
/var/log/maillog:NOQUEUE: reject: RCPT from localhost[::1]: 454 4.7.1 [email protected]: Relay access denied;
[email protected] [email protected] proto=ESMTP helo=<mail.example.com>
NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 554 5.7.1
Cause
The localhost IPv4 and IPv6 addresses are not whitelisted.
Resolution
Add localhost IPv4 127.0.0.1 and IPv6 ::1/128 addresses to the white list:
Note: By applying the following solution, the limits on outgoing mail will not work.
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Go to Tools & Settings > Mail Server Settings > White List
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Click Add Network > add 127.0.0.1 to the IP address/mask field > click OK
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Click Add Network > add ::1/128 to the IP address/mask field > click OK
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