https://bugs.exim.org/show_bug.cgi?id=2535
--- Comment #2 from Jeremy Harris <jgh146exb@???> ---
"src/retry.c" line 658
if (message_length > 150) message_length = 150;
I don't know if that comment (BDB having a fixed record size) is still true.
It doesn't help that the documentation for DBD is abstruse or nonexistent.
One of the reasons to move away from it. Meantime, Exim does support building
with alternate DB libraries: gdbm or tdb. I don't see mention of limits
in their docs. A build with gdbm and with that restriction relaxed sailed
through the testsuite, apart from the one testcase that checks the retry DB
resulting from a stupidly long 550 response to RCPT.
Naturally, with such a relaxation you would be increasing your exposure to
a malicious actor (yes, one you are trying to send to - but consider bounces).
They could inflate your retry DB by that factor.
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