No.  Well designed ones won't do that to you.

Scott K

On Friday, January 25, 2019 01:51:55 AM Matt Wong wrote:
> This gets closer - and as far as I tested, it's not the name, but rather
> the ip to wich inet_interfaces is set to. Default seems "all" - wich
> includes the IPs of all interfaces + loopback - and it seems the error
> is caused by some quirk that postfix doesn't want to deliever to any ip
> it self is set to. It doesn't matter if you set interfaces to loopback
> and send mail to the nic-IP or vise versa - as long as they different.
> 
> As I scrolled through the docs - seems there is no config option to
> override this behaviour like "ignore loopback" - so it seems this check
> is hardcoded in the source.
> 
> I also tried mini_sendmail - but as you have to override sendmail
> yourself - it gets overridden by package update - but I guess this issue
> can be said about just any package-based distribution.
> 
> Matt
> 
> Am 25.01.2019 um 01:05 schrieb Viktor Dukhovni:
> > On Thu, Jan 24, 2019 at 05:15:58PM -0600, Noel Jones wrote:
> >> On 1/24/2019 4:54 PM, Matt Wong wrote:
> >>> Well, I got a bit further: When listing mailq postfix complains
> >>> about "127.0.0.1 loop back to myself".
> >> 
> >> Change the postfix "myhostname" parameter to something other than
> >> what James uses.
> > 
> > While that's necessary, it is typically not sufficient.  One also
> > needs to make sure that that destination IP address is not listed
> > in "inet_interfaces".
> > 
> > In this case, an explicit setting of "inet_interfaces" to just the
> > public IP address of the machine would be required.
> > 
> >      main.cf:
> >     # Choose a non-loopback interface IP
> >     #
> >     inet_interfaces = 192.0.2.1
> >     
> >     # Choose a name that is different from the name used in
> >     # the SMTP 220 greeting banner or EHLO response of the
> >     # non-Postfix loopback SMTP service.
> >     #
> >     myhostname = mail.example.com
> >     
> >     ...

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