Email Forwarding

Hi,

Can anyone tell me if it is possible to forward email using DNS from eg. user@domain.com to user@domain2.com, that is, the user name is retained but the email goes to another domain. I have several domains that are effectively aliases, but I want to forward mail to a mail filtering service but keep the user so that the filtering service can re-forward the email to the correct mailbox.

Setting up a single forwarding email address so that any mail to the domain goes to a single mailbox is not sufficient as the mail filtering service wouldn't know which user to return the mail to - is there a simple way to send mail to the correct mailbox using DNS (or any other way for that matter)?

Thanks

Email forwarding is a mail server role. Once the target of your MX records recieve the email, that server should do whatever filtering is appropriate THEN forward emails to another email address if they pass the check.