Grant, thanks for your fast response. Grant Taylor via mailop <mailop@mailop.org> (Di 18 Okt 2022 00:41:24 CEST):
> I would (try to) configure my MTA to re-wrap the logical line to conform to … Modification of existing headers isn't something I would recommend. Except for headers that aren't protected by DKIM. > I would naively assume that Exim (or any contemporary MTA) could deal with > logical (unfolded) header lines of largely any length. Exim *can* process these overlong headers. But its default config rejects the transport of messages containing them. (Probably the default config even rejects such messages, I'd need to check.) The *intention* of my question was more like "what do you do with such messages", as I believe that I'm not the only one seeing them. OTOH *iff* I'm the only one, than the issue might be scoped to a specific sending system. Although the reporter told me, that they're lots of such messages. > If it wasn't for the messages purportedly being from MS Outlook 16, I'd > wonder if this was some sort of attack. The message itself wasn't suspicious and had a trustworthy sender. (But I'm not sure if it was really an Outlook generated message, or some sort of script impersonating as Outlook.) -- Heiko
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