On Fri, 8 Jan 2016, Robert Blayzor wrote:
What is the best way to handle/verify valid forwarding addresses from users.
We have had a problem where old accounts with forwards in them just keep
accepting email and then trying to deliver them to no longer existent
remote email accounts.
Is there a way/best practice to verify the forwarding address before
accepting the message being delivered? This would allow us to reject it
at SMTP time rather than letting thousands of messages queue up for
delivery and then ultimately bounce.
There is recipient-verify callout/callforward (chapter 44 onwards).
I used to use callouts, but eventually gave up (I no longer have my notes
but the problem may have been *sender* verify callback).
Yours may be a case that is less problematic.
Looking at the manaul now there are many new options for callouts
since I used it in anger.
--
Dr. Andrew C. Aitchison
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