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DB mail was working fine using SQL Server 2014; however since we moved our email to Office365 online Exchange, we are having issue. Whenever there are rapidly generated emails by our application; then sending emails is stopped with following message:

The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 3 (2018-04-08T08:25:06).
Exception Message: Cannot send mails to mail server. (Failure sending mail.)

Service again starts sending emails automatically after a lag of few hours.

I have already checked email account separately and it is working fine.

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This is a limit set by Office 365. Check this image captured from microsoft technet post

img

Based on your subscription, limits are there for sending total emails per day as well as bulk email at a time. Same has been confirmed in this Microsoft blog question

That's why your task stops sending email for sometime to reset its Recipient limit.

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I am checking my system in relation to above information. So far seems to be this issue will be resolved, problem was with Office 365 Limits

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