O365 - Mass Email Alert

[robyholmes]

Hi All,

 

I'm wanting to make sure we don't have a data breach by someone in school putting a number of external contacts in the 'To' field of an email. I'd like two rules so the student one has a lower limit but the staff rule is a little higher.

 

Has anyone managed to configure something like this? I've look at Mail Flow, Office 365 Alerts, Data Loss Policies etc. I can't find anyway of doing this?

 

Thanks, Rob

[TechMonkey]

You can set Recipient limits in Mail Flow.

https://docs.microsoft.com/en-us/exchange/mail-flow/message-size-limits?view=exchserver-2019

[robyholmes]

You can set Recipient limits in Mail Flow.

https://docs.microsoft.com/en-us/exchange/mail-flow/message-size-limits?view=exchserver-2019

 

As far as I can see it only lets you limit by the total number of recipients, weather that's in BCC or TO fields. So unless I've understood it wrong it would still block emails when people use the BCC field?

[TechMonkey]

Sorry, I understand better now. Yes if the limit was set to 100 people it would block if you tried to send to 101 people in the TO field, 101 in the BCC or 51 in each.

 

I've not seen anything that counts To: and/or CC: exclusively.