I would set up a catchall email on the domain xyz.com which sends to a single destination email address.  Then generate abc001, abc002, etc email address to users to have.<p>On that single email address you could parse for the unique email ids and then process as you intended to.  Depending on your mail provider you could simply have a POP3 or IMAP client or a full featured SMTP &#x2F; MTA server.<p>I use a similar trick when people ask me for an email address, it is typically some.person@example.com.  Then if that source spams me, etc then I can easily block emails to some.person without affecting my &quot;real&quot; email which is simply mail@example.com.