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List:       postfix-users
Subject:    [pfx] Re: Selection of a custom smtp-transport based on recipient addresse's MX with check_recipient
From:       Northwind via Postfix-users <postfix-users () postfix ! org>
Date:       2024-05-19 21:57:39
Message-ID: 87179f95-4156-49c3-bde3-720aa5cd5164 () secubox ! org
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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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