[pfx] Re: Selection of a custom smtp-transport based on recipient addresse's MX with check_recipient_mx_access doesn't work

[Northwind via Postfix-users]

This is most likely the issue of outlook, not yours.
AFAIK outlook has the policy of IP blacklist. Maybe your IP happens to 
hit it.

regards.

After a few hundred mails to different addresses who's domains use a 
protection.outlook.com MX, the receiving servers respond with "...451 
4.7.500 Server busy. Please try again later..."
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