I recommand using MS SenderSupport website for this problem : 
https://sendersupport.olc.protection.outlook.com/snds/data.aspx 
(you need to create an account and register your IP / AS / whatelse).

Rémy


-----Original Message-----
From: [email protected] <[email protected]> On Behalf 
Of Per Jessen
Sent: Tuesday, 27 April 2021 19:04
To: [email protected]
Subject: [swinog] mail.protection.outlook.com said: 451 4.7.500 Server busy. 
Please try again later

Does anyone have any idea what sort of rate limits are used by
Office365 ?  We seem to be hitting $SUBJ more and more often, so we have been 
scaling back delivery frequencies.  It just seems a bit random and arbitrary. 



--
Per Jessen, Zürich (19.4°C)




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