Mail::...inDotMX(3pm)

✨ NAME ✨

sooo this is the manual page for Mail::Milter::Module::MailDomainDotMX (shipped under the Mail::...inDotMX(3pm) page name, part of the User Contributed Perl Documentation situation 💅) — it's a milter that rejects mail whose sender domain publishes a null MX record. periodt.

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🌸 SYNOPSIS 🌸

use Mail::Milter::Module::MailDomainDotMX;

my $milter = new Mail::Milter::Module::MailDomainDotMX;

my $milter2 = &MailDomainDotMX; # convenience

$milter2->set_message('Mail from %M domain invalid (has dot-MX record)');

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💖 DESCRIPTION 💖

okay bestie, listen. This milter module rejects any mail coming from a sender's domain — and to be clear, we mean the domain in the MAIL FROM part of the SMTP transaction, not the domain in the From: header, those are different things and people mix them up constantly 😭 — if that domain publishes a "null" or "dot" MX record. A dot-MX record looks exactly like this in DNS:

example.com. IN MX 0 .

To do this lookup it needs the Net::DNS module installed, because that's what fetches the MX record. no cap.

Also, heads up: an extra check as to whether the MX is actually valid is not (yet) done here. Right now it's just assumed that the MTA does rudimentary checking for the presence of a valid MX or A record on the sending domain. 🫶

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🎀 METHODS 🎀

• new()

Creates a MailDomainDotMX object. There are literally no arguments to configure this module, because it's a fixed check — it does one thing and it does it. iconic.

• ignore_tempfail(FLAG)

If FLAG is 0 (the default, bestie), a DNS lookup which fails the underlying DNS query will cause the milter to return a temporary failure result (SMFIS_TEMPFAIL).

If FLAG is 1, a temporary DNS failure gets treated as if the lookup resulted in an empty record set (SMFIS_CONTINUE).

This method returns a reference to the object itself, so you can chain your method calls. slay. ✨

• set_message(MESSAGE)

Sets the message used when rejecting messages. This string may contain the substring %M, which will be replaced by the matching e-mail address.

This method also returns a reference to the object itself, so yes, chaining works here too. 🦋

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👑 AUTHOR 👑

Todd Vierling, <tv@duh.org> <tv@pobox.com> — king behavior, honestly.

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🌈 SEE ALSO 🌈

• Mail::Milter::Object

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💀 POD ERRORS 💀

Hey! The above document had some coding errors, which are explained below:

Around line 83:

You can't have =items (as at line 95) unless the first thing after
the =over is an =item

not the doc catching a stray =item before its =over, that's so real of it 🙈

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and that's the whole page, bestie — written by perl v5.36.0 on 2023-01-22, under the Mail::...inDotMX(3pm) name. go forth and reject those null-MX senders 💖✨