Discussion in 'Mail Chat' started by Diablo, Aug 3, 2016.
Is there a way to detect if an address is being forwarded to another address?
Most of the recipient email servers will show you the information after you issue a RCPT TO. It is usually a 250 code, followed by "User unknown. Will forward to xxxx@xxxx". You can test this out setting your own mail server to forward email sent to non existant accounts to a catch all address.
What MTA does that ?
I've seen quite a few while working on lists hygiene systems. From the top of my head, I remember Icewarp (used to be Merak) by default setup settings.
The response code is actually 251, but I've seen it with a 250 more often like I explained orginally
You can also find the reference on the SMTP protocol specification.