On 10/17/22 4:02 PM, Heiko Schlittermann via mailop wrote:
Hi,
Hi,
how do you deal whith incoming messages having a Thread-Index header ... with about 1200 chars.
I can't say as I've had the (dis)pleasure of dealing with such.I would (try to) configure my MTA to re-wrap the logical line to conform to the physical line length limits set in RFCs; 1000 characters /including/ the trailing <CR><LF>.
The regular Exim config doesn't forward this (and probably can't bounce it, as a copy of the headers would make it into the bounce message, which in turn has an oversized header then too.)
I would naively assume that Exim (or any contemporary MTA) could deal with logical (unfolded) header lines of largely any length.
I would also assume that it would re-wrap any non-compliant physical lines to be compliant.
On 10/17/22 4:11 PM, Heiko Schlittermann via mailop wrote:
To be more precise: The one I have is 1000 chars w/o the header field name and w/o the line ending terminator. It then continues on the next (indented) line, which is ok.
If it wasn't for the messages purportedly being from MS Outlook 16, I'd wonder if this was some sort of attack.
-- Grant. . . . unix || die
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