On 12/12/22 4:49 AM, Seymour J Metz wrote:
That's a SHOULD, not a MUST. I don't recall whether the SMTP external
writer (z"l) generated message-id or whether the application needed
to include it in its sysout.
You're using RFC language.
Remember, each and every email operator is free to do what they want to.
Google / Gmail has recently (~3 months?) been requiring headers to exist
that almost all legitimate email has that spam is more likely to not have.
Requiring a header to exist that all contemporary mail clients (MUAs)
have added for more than 20 years, is a fairly safe thing. It's only
atypical email sending systems, which aren't MUAs, that have been
running into this problem. Or really old / unmaintained MUAs, likely
from 20+ years ago.
--
Grant. . . .
unix || die
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