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26819 – Changes to the legacy SMTP Authenticated Submission client protocol in Exchange Online (archived)

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check before: 2018-04-01

Product:

Exchange

Platform:

Online, World tenant

Status:

Launched

Change type:

Links:

Details:

SMTP Authenticated Submission (also known as SMTP Client Submission) protocol allows clients and apps using smtp.office365.com to send a message from an Office 365 hosted mailbox. Changes to the protocol are being rolled out may affect customers who send using this protocol. Moving forward, sent emails will now be stored in the Sent Items folder of the mailbox as is the case with other client protocols. Also, a maximum of three active concurrent connections submitting emails to our service per mailbox will be allowed. Additional connections will be rejected with the error: 4.3.2 STOREDRV.ClientSubmit; sender thread limit exceeded. Given that throttling is already in place to limit submissions to 30 per minute, this additional limit will not affect most of our customers.

Change Category:
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Scope:
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Release Phase:

Created:
2018-06-01

updated:
2019-01-19

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Last updated 2 years ago

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