no, it's statically configured
  
  

  
>   
> On aug. 9, 2017 at 3:08 p.m.,  <Dominic Raferd 
> (mailto:domi...@timedicer.co.uk)>  wrote:
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> On 9 August 2017 at 12:35, Mai Ling  <mailinglist...@gmail.com 
> (mailto:mailinglist...@gmail.com)>  wrote:
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> >   
> >   
> >   
> >
> >  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.  
> >  ‚Äč..
> >   
> >   
> >   
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> 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.
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