https://bugs.exim.org/show_bug.cgi?id=2677
--- Comment #1 from Jeremy Harris <jgh146exb@???> ---
For 4.93 onwards the maximum address (i.e. local_part@domain) length that can
be matched by an address-list element was restricted to 256. Previously the
arbitrary limit was multiple kB, but still present. We can easily expand the
value somewhat, but it must still be limited to avoid a possible remotely-
caused memory exhaustion attack.
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