If you have multiple domains, you can make use of the free domain aliasing option. Domain aliases can be added to your main domain directly in the webinterface. Any email sent to the domain alias will be delivered to the same user on the main domain.
Example:
Let's presume you have the main domain example.com, with destination mail server mail.example.com, and the alias domain example.org. Email sent to myemail@example.org will be delivered to the SMTP server mail.example.com with the recipient myemail@example.com. The email "To:" headers will still show the original recipient myemail@example.org'.
Control panel
Alias domains don't have separate access to the control panel. Since all SMTP traffic to the domain alias is rewritten to the main domain, any changes/lookups on the main domain will simply include the alias domain traffic as if it was sent directly to the main domain. If you are searching for a specific email sent to a domain alias using the log search, the recipient will therefore show as user@maindomain.
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