FYI it was a Microsoft O365 configuration issue, indeed. In our hybrid
environment (O365 + Postfix) a routing configuration that is commonly
enabled in O365 (called "inbound connector") generated that loop.
After a few weeks of mail exchanges with Microsoft support they gave
us the solution. If you
> > 14 times
> > db8p195mb0565dd65da92d1861c8946u48c...@db8p195mb0565.eurp222.prod.outlook.com
> > 14 times
> > vi1p195mb02560627a8aa5227c95208cd80...@vi1p195mb0256.eurp222.prod.outlook.com
> > 14 times
> > vi1p195mb0463506au7u3dc47au795a8u92...@vi1p195mb0463.eurp222.prod.outlook.com
>
> That p
Got it, Wietse.
What do you mean with "fix the forwarding at your end"? Can I tweak
something different in Postfix?
Have a nice day.
Il giorno mer 18 mar 2020 alle ore 18:13 Wietse Venema
ha scritto:
>
> ego...@gmail.com:
> > Thanks Dusan and Wietse, I searched in postfix log files and I can
> >
ego...@gmail.com:
> Thanks Dusan and Wietse, I searched in postfix log files and I can
> confirm that looping emails have the same ID. "Normal" emails ID
> appear in the log files a few times (depending on the number of
> recipients I suppose), but looping emails appear many times:
>
> 14 times
>
Thanks Dusan and Wietse, I searched in postfix log files and I can
confirm that looping emails have the same ID. "Normal" emails ID
appear in the log files a few times (depending on the number of
recipients I suppose), but looping emails appear many times:
14 times
db8p195mb0565dd65da92d1861c8946
Dusan Obradovic:
>
> > On Mar 18, 2020, at 11:45 AM, ego...@gmail.com wrote:
> >
> > host xxx-xxx.mail.protection.outlook.com[X.X.X.X] said: 554 5.4.14 Hop
> > count exceeded - possible mail loop ATTR1
> > [xxx-xxx.prod.protection.outlook.com] (in reply to end of DATA
> > command)
> >
>
> I sus
> On Mar 18, 2020, at 11:45 AM, ego...@gmail.com wrote:
>
> host xxx-xxx.mail.protection.outlook.com[X.X.X.X] said: 554 5.4.14 Hop
> count exceeded - possible mail loop ATTR1
> [xxx-xxx.prod.protection.outlook.com] (in reply to end of DATA
> command)
>
I suspect this is based on received heade
Hello everybody, I am using a Postfix mail relay to modify sender
addresses of emails coming from my company Office 365 cloud-hosted
domain: I configured a connector on Office 365 to route all emails to
Postfix.
Everything works perfectly, except for some recipient domains that are
also hosted on o
