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Summary: Option for freezing instead of bouncing in case of
A while ago I run into a bad issue: My LDA segfaulted. The behaviour I would
have expected is freezing the message. Exim bounced it back instead, so some
messages got essentially lost (even though the sender received the bounce).
This is documented behaviour, so I cannot really complain...
The LDA used back then was dovecot's deliver. I like to think this won't happen
any more, because it evolved a lot since then. But to be really sure, the pipe
transport should have an option to freeze messages instead. This is just what
the attached patch does: Add the option freeze_signal to the pipe transport.
I would even say we should enable this by default, but that's debatable, of