Re: [OT] Regular DKIM issues on this ML (was: Re: why !oh why Debian and application list)
On Thu, Jun 18, 2020 at 08:02:11AM +1200, Richard Hector wrote:
> > See <https://jdebp.eu/FGA/mail-mbox-formats.html> for more details.
> I understand the phenomenon. I don't understand why modern software (eg
> the list software) still does it.
Well, imagine you're a mailing list. A dozen people are subscribing
to you, and you have no way to know which MTA and mailbox formats each
of your subscribers is using.
If you don't do the From mangling, and you send a message to
subscriber #7 who happens to be using a traditional /var/spool/mail
mbox format, the results could be undesirable -- #7 will see half a
message followed by a broken message.
The easy fix is to perform From mangling on every message that passes
through you. That way, people won't see massively broken messages.
Occasionally, people will see a single broken line in a message, but
99% of the rest of your traffic will be OK.
It's a conservative strategy, and it works... mostly. Close enough.
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