Today I was trying to help debug an email list that wasn't properly filtering mail by the
1000-character SMTP line-length limit. This required attaching the original, SMTP-invalid .eml to
send to the postmaster there.
However, it seems MUAs nearly-universally do not handle this correctly. Specifically, at least
GMail's Web UI, Apple iOS Mail, and local Thunderbird all happily attach the original .eml as-is in
plaintext and create mails which violate the SMTP limit.
Is the 1000-character limit just old hat these days and ignored enough places that its not worth
bothering with?
Matt
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