07-15-2016
Thank you for your thoughts RudiC,
I can confirm that it is always the same sender because we force the sender name.
We have considered DNS, but the frequency seems too high to be mistakes so the mail won't deliver (besides we just need to get it into the queue) and if it was a general problem I wouldn't think we should get any processed really quickly. The nearest I have on DNS is that the mail is from application generating the mail is an active-active cluster and what appears in the log is the boot IP address sending mail in, not a DNS name. Perhaps it is trying to reverse lookup, but the time is not consistent so leads me away from that being the issue. DNS query timeout has not yet been adjusted as people are not keen to fiddle with it, but it's still an option if we can be fairly certain.
Kind regards,
Robin
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LEARN ABOUT DEBIAN
mail::milter::module::maildomaindotmx
Mail::Milter::Module::MailDomainDotMX(3pm) User Contributed Perl Documentation Mail::Milter::Module::MailDomainDotMX(3pm)
NAME
Mail::Milter::Module::MailDomainDotMX - milter to reject mail whose sender domain publishes a null MX record
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)');
DESCRIPTION
This milter module rejects any mail from a sender's domain (in the MAIL FROM part of the SMTP transaction, not in the From: header) if that
domain publishes a "null", or "dot" MX record. Such a record looks like the following in DNS:
example.com. IN MX 0 .
This lookup requires the Net::DNS module to be installed in order to fetch the MX record.
An extra check as to whether the MX is valid is not (yet) done here. It is currently assumed that the MTA does rudimentary checking for
the presence of a valid MX or A record on the sending domain.
METHODS
new()
Creates a MailDomainDotMX object. There are no arguments to configure this module, as it is a fixed check.
ignore_tempfail(FLAG)
If FLAG is 0 (the default), 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 will be treated as if the lookup resulted in an empty record set (SMFIS_CONTINUE).
This method returns a reference to the object itself, allowing this method call to be chained.
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 returns a reference to the object itself, allowing this method call to be chained.
AUTHOR
Todd Vierling, <tv@duh.org> <tv@pobox.com>
SEE ALSO
Mail::Milter::Object
perl v5.8.8 2004-02-26 Mail::Milter::Module::MailDomainDotMX(3pm)