![]() ![]() This change for concurrent connections will better protect the service from large bursts of email messages that are sent by automated systems within a short time period. Recipient rate limit of 10,000 recipients per dayĮxceeding these limits will cause the following issues:Įxceeding the per minute limit causes email delivery delays, any excess in message submission will be throttled and successively carried over to the following minutes.Įxceeding the per day limit causes the following error message:ĥ54 5.2.0 :SubmissionQuotaExceededExceptionįor more information, see sending limits in Exchange Online.If an application tries to send more than three messages at the same time by using multiple connections, each connection will receive the following error message:Ĥ32 4.3.2 STOREDRV.ClientSubmit sender thread limit exceededĪdditional throttling limits for the SMTP Authentication protocol are: Under the new limit, up to three concurrent connections are allowed to send email messages at the same time. The service has various limits to prevent abuse and to ensure fair use. For a mailbox that sends a high volume of email messages, the retention policy for the Sent Items folder should be set to empty the folder before the mailbox becomes full.ĭepending on the application or device that sends email messages, you may experience one of the following errors if the mailbox becomes full:ĥ54 5.2.2 mailbox full :QuotaExceededException.MapiExceptionShutoffQuotaExceededĥ54 5.2.2 mailbox full :QuotaExceededException.MapiExceptionQuotaExceeded New throttling limit for concurrent connections that submit messages If the mailbox gets full, sending email messages will be blocked. ![]() Be aware that the Sent Items folder contributes to the mailbox size. ![]()
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