Symptoms
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It is not possible to send mail via Roundcube:
PLESK_ERROR: SMTP Error (535): Authentication failed.
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The following error can be found in
/var/log/maillog
:postfix/smtpd[30391]: NOQUEUE: reject: RCPT from example.hostname.com[::1]: 454 4.7.1 <[email protected]>: Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<webmail.test.com>
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There is no user value in Roundcube’s configuration file:
# grep smtp_user /usr/share/psa-roundcube/config/main.inc.php
$rcmail_config[‘smtp_user’] = ”;OR
# grep smtp_user /usr/share/psa-roundcube/config/defaults.inc.php
$config[‘smtp_user’] = ”;
Cause
Misconfiguration in Roundcube settings.