Jim Cheetham wrote:
Hi Mailop,
We run our listening mail servers with a maximum header size limit of 32768
(Sendmail's default).
We've found at least one "legitimate" sender whose headers are far bigger than that, and
the reason for this isn't a very long path :-) it's all the
"x-microsoft-exchange-diagnostics-untrusted" multiline headers being dumped in there by
one of the O365 tenancies outside our control.
Obviously we're asking the sender to see if they really need to have all that
header data added, but in the meantime I'd like to ask this community whether
you see that 32KB max header size as a sensible limit in today's conditions?
Personally...
32k in a header is bad, wrong and should be discarded with prejudice.
32k in headers combined is excessive and whilst a looping mail could
have this sort of size I'd suggest it is excessive and I wonder how many
clients would safely deal with such sizes... certainly it isn't mobile
sensible and I wouldn't be considering changing limits to accept them.
--
Michelle Sullivan
http://www.mhix.org/
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