On 10/11/21 10:19 PM, John via mailop wrote:
Hello Matt,
The answer is yes, it's not good practice to block messages containing long
lines in emails. That will likely cause problems at either the sender or
recipient. Senders may receive non-delivery notifications, recipients may miss
mails.
RFC5322 (2008) advises to handle long lines at least up to 998 characters.
However, there is no pressing technical need to filter. The 1000 character rule
appeared in rfc821 (1982), probably because it was believed that it was a good
idea to limit the format to the capacity of hardware and software at the time.
We've moved on, systems have sufficient memory and mail readers have been smart
enough to wrap long lines for a long time already.
IME the MUAs are generally not the problem here. The (semi)automated
emails that include (template-based, often) text/html MIME parts that
include lines of tens of thousands of characters long, and no end in
sight, are. Depending on your infrastructure and implementation language
of choice that can be a bit of a challenge to handle correctly.
--Erwin
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