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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.
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://www.experts-exchange.com/questions/22153333/Delivery-Refused.html
Find answers to Delivery Refused from the expert community at Experts Exchange
https://www.experts-exchange.com/questions/28255070/Exchange-2013-refusing-inbound-messages-571-Delivery-not-authorized-message-refused.html
Find answers to Exchange 2013 refusing inbound messages 571 Delivery not authorized, message refused. from the expert community at Experts Exchange
https://community.spiceworks.com/topic/694280-exchange-2010-cannot-receive-emails-from-a-domain
Dec 04, 2016 · otherdomain.com are using hosted Exchange (or similar) and have not configured otherdomain.com with permissions to send to you either at the server level or at the antispam level. "571 Delivery not authorized, message refused" comes …4.2/5(188)
https://answers.microsoft.com/en-us/office/forum/office_2010-outlook/delivery-was-refused-code-521/3fcc1a80-0787-425c-a9e6-00d89ae3155e
Mar 19, 2020 · The message reached the recipient's e-mail system, but delivery was refused. Attempt to resend the message. If it still fails, contact your system administrator. <server.domain.com #5.2.1> I already tried: to create a new profile, remove all profiles, configuration files in c:\users\user\appdata\local\microsoft\outlook and .pst file.
http://forums.msexchange.org/m_1800501295/mpage_1/key_/tm.htm
Feb 11, 2009 · 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 ... so I think its an exchange server setting at our end. Is there anything else I can check? btw Its Exchnage 2007 not 2003, I think I posted this in the 2003 section. ...
https://blog.rmilne.ca/2018/07/24/mail-not-flowing-from-office-365-to-on-premises-exchange-server/
This is a repro of a customer reported issue where they were having issues sending email from Office 365 to on-premises Exchange servers. Apparently this had been working previously with no issues, then mailflow started to have problems.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/non-delivery-reports-in-exchange-online
Admins can learn about non-delivery reports (also known as NDRs or bounce messages) that are generated in Exchange Online.
https://www.computerperformance.co.uk/exchange-2010/smtp-connector/
Mar 01, 2001 · Because every delivery strategy involves the Hub Transport server, you can appreciate why every Exchange 2010 organization needs at least one server with this role. Indeed, Microsoft’s recommendation is to have one server with the Hub Transport role in each Active Directory site. Supporting Components for the Exchange 2010 SMTP Connectors
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