The emails are forwarded to another mailbox without enabled email forwarding in Plesk

Symptoms

• The emails are forwarded to another mailbox but the forwarding is disabled in Plesk > Domains > example.com > Mail Addresses > [email protected] > the Forwarding tab

• Entries in /var/log/maillog:

  sieve: [email protected]: redirect action: forwarded to [email protected]

Cause

There is an additional filter in webmail configured.

Resolution

1. Log in to webmail https://webmail.domain.tld

2. Go to Settings > Filters

3. Find the filter that can be responsible for the redirect. For example:

   

4. Remove the filter by clicking the Delete button