On 9 August 2017 at 12:35, Mai Ling  <mailinglist...@gmail.com 
(mailto:mailinglist...@gmail.com)>  wrote:
>  My small office client upgraded his internet connection and I've updated the 
self hosted postfix configuration file with the new IP address.
>
> Soon after, email users began complaining about bounces they started 
receiving for some emails they sent.


On aug. 9, 2017 at 3:08 p.m.,  <Dominic Raferd 
(mailto:domi...@timedicer.co.uk)>  wrote:
Just checking, is the new ip dynamic? Dynamic ips are blacklisted by many rbls 
automatically (and requests for exceptions will be ignored), so in this case   
you must use a relayhost.

On 09.08.17 17:00, Mai Ling wrote:
no, it's statically configured

you need proper FcRDNS - ask your new ISP to configure reverse DNS pointing
to something that already points to your new IP (your mail server name
probably)

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