Emails with attachments teams channel

Hi everyone,

We have an issue where when people send emails to a channel with attachments larger than 10 MB the email will not arrive and no reject will be sent.

We tried to set up a transport rule to reject the message according to Microsoft teams channel limits article, but it doesn't work.

And here is my transport rule:

We also tested several messages with various attachment sizes and this also didn't tell us why the email isn't arriving to the channel.

As far as message trace from exchange the email is delivered. I don't know where else to check because we don't limit anything there.

Rahamim.

VasilMichev
Apr 13, 2021
Emails sent to channel aliases are routed through a "shadow" tenant, so their processing is a bit of a black box for us as customers. Message trace, mail flow rules, NDRs - they only affect a part of the process, and we have zero control over the rest. Just live with it 🙂

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