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 OSX
net::dns::mailbox
Net::DNS::Mailbox(3) User Contributed Perl Documentation Net::DNS::Mailbox(3)
NAME
Net::DNS::Mailbox - DNS mailbox representation
SYNOPSIS
use Net::DNS::Mailbox;
$mailbox = new Net::DNS::Mailbox('user@example.com');
$address = $mailbox->address;
DESCRIPTION
The Net::DNS::Mailbox module implements a subclass of DNS domain name objects representing the DNS coded form of RFC822 mailbox address.
METHODS
new
$mailbox = new Net::DNS::Mailbox('John.Doe@example.com');
$mailbox = new Net::DNS::Mailbox('John Doe <j.doe@example.com>');
Creates a mailbox object which represents the DNS domain encoded form of the mail address specified by the character string argument.
The argument string consists of printable characters from the 7-bit ASCII repertoire.
address
$address = $mailbox->address;
Returns a character string corresponding to the RFC822 form of mailbox address of the domain as described in RFC1035 section 8.
The string consists of printable characters from the 7-bit ASCII repertoire.
DOMAIN NAME COMPRESSION AND CANONICALISATION
The Net::DNS::Mailbox1035 and Net::DNS::Mailbox2535 subclass packages implement RFC1035 domain name compression and RFC2535
canonicalisation.
COPYRIGHT
Copyright (c)2009,2010 Dick Franks.
All rights reserved.
This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
perl, Net::DNS, Net::DNS::DomainName, RFC822, RFC1035, RFC5322
perl v5.16.2 2012-01-27 Net::DNS::Mailbox(3)