>________________________________________ >From: Vincent Fox <vb...@ucdavis.edu> >Sent: Friday, May 13, 2016 2:57 PM >To: users@spamassassin.apache.org >Subject: Re: understanding HELO_DYNAMIC_IPADDR
>On 05/13/2016 12:29 PM, Daniel J. Luke wrote: >> >> While you are at it, make sure your forward and reverse dns match. >> >At least weekly, I get someone bickering with me that reverse DNS is not any >kind of requirement to be a legitimate server. >Often it comes from well-paid network administrators. >It's Friday, time to go have a beer and forget about how >conventions and basic internet plumbing are TOO HARD >for some people. Think of the PTR record on a mail server like caller ID. If your PTR record doesn't match an A record, then most mail servers will penalize your mail to some degree because it looks like "caller blocked" or "unknown caller". Do you answer phone calls like these? I don't. My mail servers send millions of emails a week out to the Internet and have some very spammy looking stuff coming from some of our customers because the software they are using to send emails is horrible with missing headers, bad timestamps, no unsubscribe process, etc. But I don't have any issues with recipient mail servers blocking or rejecting because I have proper FCrDNS (PTR and A record complements). This is a very simple concept and yet most mail admins don't know it or follow it. I often have to work around incoming mail problems because the sending mail server isn't setup properly to be trusted by the Internet. http://multirbl.valli.org/lookup (See FCrDNS) https://www.rackaid.com/blog/email-dns-records/ https://senderscore.org/lookup.php Dave
