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Mail forwarding set in Roundcube not working, the following occurs in
CONFIG_TEXT: 451 4.7.1 Service unavailable - try again later; email@example.com firstname.lastname@example.org proto=ESMTP helo=<mailserver.example.com>
- There is a Roundcube filter in RoundCube > Settings > Filters that has forwarding rule set as "is equal to"
A rule for redirecting mail is specified incorrectly in RoundCube settings.
Change the rule in RoundCube > Settings > Filters > filtername as follows: