On 21 Apr 2021, at 15:37, Wayne via Exim-users wrote:

Does this include lines in the body of the messages or just the headers?

Both. See RFC5322 Section 2.1.1. MTAs can safely fix over-long header lines by folding them, but to fix a body with over-long lines, they'd need to either modify the body content by adding line breaks (very bad) or apply a MIME encoding that conforms to the 998-character limit (still not good, although Sendmail will do this in some configurations.)

I think the body of the message may voilate the limit, and of course,
the message is generated by firmware so I won't be able to correct this.

If you can, report that as a bug to the vendor.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire

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