1. Log into the Plesk >Click- 'Server' > 'Mail'
2. Inside 'Server-wide mail preferences' option-> In the 'Relaying' section - Confirm you have selected 'authorization is required' option and you have ticked the POP3 and SMTP option
3. Check that you have added all local and virtual domains to /var/qmail/control/rcpthosts . Never leave the file rcpthosts as blank as this will lead to an open relay
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