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My company has Office 365.

We use account for send email (SMTP/SSL) https://www.gmass.co/blog/office365-smtp/#office

We get error similar like this, but using Exchange Online https://docs.microsoft.com/en-us/answers/questions/817963/error-in-processing-451-470-temporary-server-error.html

We get the error:

Error in processing. 4.3.111 Temporary server error. Please try again later MRH1 [Hostname=PA4PR04MB9341.eurprd04.prod.outlook.com]

it is intermittent.

Any suggestions for troubleshooting ?

Updated:

Support recomended:

1- Check concurrent connections (max 3) and how much applications use the email account for sending.

https://docs.microsoft.com/en-us/exchange/troubleshoot/send-emails/smtp-submission-improvements

2- Check sending limits for Exchange on line.

• 30 messages per minute
• Recipient rate limit of 10,000 recipients per day

https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits

3- Check that source IP has SPF register

4- Check TLS version using by the app. Must be 1.2 version. Other case, enable the parameter for TLS versions older.

https://techcommunity.microsoft.com/t5/exchange-team-blog/new-opt-in-endpoint-available-for-smtp-auth-clients-still/ba-p/2659652

  1. Set AllowLegacyTLSClients from cmdlet Set-TransportConfig to "True"
  2. Older clients and apps must be configured using endpoint smtp-legacy.office365.com
Kiquenet
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1 Answers1

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I want to confirm if all users in your organization encounter this issue? Running EXRCA to test outbound mails and check if there any other error messages.

In addition, Comparing steps in the blog and check if you are configured incorrectly in somewhere.

Joy Zhang
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