when send email to Yahoo sometime show "User is receiving mail too quickly tnmpmscs"

[thanhtien19]

when send email to Yahoo sometime show "User is receiving mail too quickly tnmpmscs" and some retry then these email send ok , how to setting to exchange edge  send slow outbound email.

[#2]

Hi @thanhtien19,

The error message "User is receiving mail too quickly" typically indicates a temporary failure in mail delivery, often associated with security measures such as Greylisting.

Greylisting is an anti-spam technique that temporarily rejects emails from unfamiliar senders or when emails are sent too rapidly. Legitimate mail servers will automatically attempt redelivery after a temporary failure.

To regulate the email sending rate from your Exchange Server, you can adjust the message throttling settings. Message throttling encompasses limits on the number of messages and connections processed by an Exchange server, including message processing rates, SMTP connection rates, and SMTP session timeout values.

Message rate limits and throttling | Microsoft Learn

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[#3]

So very more settings , which settings can do send slow ? so I can try set SmtpMaxMessagesPerConnection to 5 to can slow send email ?

[#4 · Accepted solution]

Hi @thanhtien19,

Yes, you can adjust the SmtpMaxMessagesPerConnection setting to control the number of messages sent per SMTP connection.

To achieve this, use the following PowerShell command:

Set-SendConnector "Your Send Connector Name" -SmtpMaxMessagesPerConnection 5

Replace "Your Send Connector Name" with the actual name of your Send Connector. This command configures the maximum number of messages allowed per SMTP connection to be 5.

Please click Mark as Best Response & Like if my post helped you to solve your issue.
This will help others to find the correct solution easily. It also closes the item.

If the post was useful in other ways, please consider giving it Like.

Kindest regards,

Leon Pavesic
(LinkedIn)