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Old 06-04-2015, 03:00 AM   #1
obrisc
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Registered: Mar 2014
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Postfix not receiving Gmail on dynamic IP without proper PTR


I've got a working Postfix setup on my laptop using a dynamic IP which receives mail perfectly from AOL/Yahoo/Hotmail/GMX/. Only Gmail fails to deliver.

Absolutely nothing turns up in my mail logs and I have smtpd_tls_loglevel = 3 in my main.cf file.

My first thought is that Gmail will not deliver mail to my IP because it's dynamic and/or has no proper PTR. Can anyone confirm this? ...before I start fiddling with my main.cf config file.

Thanks
 
Old 06-04-2015, 06:48 AM   #2
obrisc
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Registered: Mar 2014
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UPDATE: I found a workaround that may confirm that goodle will not deliver mail to a MX host/server on a dynamic IP with no PTR record.

I don't have a static ipv4 IP address so I used an ipv6 one that I have and added a PTR record to it. Then I updated the DNS records to include the ipv6 MX as a backup MX as follows:

smtp.example.org MX 10 ipv4.example.org <== dynamic ipv4 without PTR
smtp.example.org MX 10 ipv6.example.org <== static ipv6 with PTR

It works for me with Postfix.

Last edited by obrisc; 06-04-2015 at 06:49 AM. Reason: update ipv4
 
  


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