Symptoms
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Email messages are forwarded to another mailbox, even though forwarding is disabled in Plesk > Domains > example.com > Mail Addresses > [email protected] > Forwarding tab
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The following is logged to
/var/log/maillog
when the messages are forwarded:sieve: [email protected]: redirect action: forwarded to [email protected]
Cause
There's a forwarding rule configured at the webmail level.
Resolution
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Log in to the domain's webmail at webmail.example.com
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Go to Settings > Filters
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Find the filter responsible for the forwarding. For example:
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Remove or disable the filter