20 Apr
2020
20 Apr
'20
1:19 p.m.
- mj:
Can anyone suggest what to do here?
I suggest you don't use Sieve for this, but simply configure Postfix to reject messages to @old.domain.com with the desired message. MTA rejections signal clearly that the message has not been delivered, and you can also include an URL pointing to a web page with more detailed information.
-Ralph