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https://bobcares.com/blog/how-to-fix-571-delivery-not-authorized-message-refused/
Sep 17, 2016 · ‘571 Delivery not authorized message refused’ error is commonly seen when mails sent to Exchange servers get rejected. Here's how to solve it.
http://forums.msexchange.org/Requested_%23571_Delivery_not_authorized%2c_message_refused_%23%23/m_1800501295/tm.htm
Feb 11, 2009 · Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator. ... Requested #571 Delivery not authorized, message refused ## Original message headers: Received: from bunker-mel-01.bfl.local ([10.0.0.5]) by bunker-mel-01.bfl.local
https://social.technet.microsoft.com/Forums/exchange/en-US/81d987d4-0c64-47bf-bf94-cfce0255d1cc/requested-571-delivery-not-authorized-message-refused-
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https://www.experts-exchange.com/questions/28255070/Exchange-2013-refusing-inbound-messages-571-Delivery-not-authorized-message-refused.html
1) Mail is rejected with the "571 Delivery not authorized, message refused" message. 2) Server does accept some mail from the internet. 3) I can send original messages to them and receive messages from them, but cannot reply to a message sent to my domain.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online
In the Exchange admin center, click Mail Flow > Connectors. In the Outbound connectors section, select the connector that's used for hybrid, and choose Edit. Verify the following information: Delivery: If Route mail through smart hosts is selected, confirm the correct IP address or FQDN is
https://community.spiceworks.com/topic/1674853-571-delivery-not-authorized-message-refused-on-some-forwarded-e-mails-exchange
Nov 03, 2016 · Some external e-mails are refused and they get following error: 571 Delivery not authorized, message refused . When I asked them to send me a test message it's working fine, but when they try to resend their e-mail, it blocks this specific e-mail. I have disable the antispam on Exchange 2007, still blocking.4.1/5(10)
https://www.petri.com/forums/topic/550-5-7-1-delivery-not-authorized-message-refused
Dec 08, 2010 · Home › Forums › Messaging Software › Exchange 2007 / 2010 / 2013 › #550 5.7.1 Delivery not authorized, message refused This topic contains 3 …
https://www.experts-exchange.com/questions/27947490/Requested-571-Delivery-not-authorized-message-refused.html
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