Sending large emails from Office 365- Admin Help (Upto- 150 MB)

In the past the largest email message you could send or receive in Office 365 was 25 MB. While 25 MB is more than enough for the majority of emails, there may be situations where you are set against that limit.

For those times Microsoft has increased the allowed maximum message size to 150 MB, giving Office 365 administrators the ability to set the maximum message size of their choosing from 1 MB up to 150 MB.

The default maximum message size for Office 365 mailboxes is still 25 MB, but Microsoft is now giving Office 365 customers the freedom to choose the maximum size setting that’s right for them.

For mailboxes to be created in Future

You can change the default for your organization by adjusting the default message size restriction. Simply go to Exchange admin center, select recipients > mailboxes then click on Mailflow Settings and select Email Size Restriction.

You can then specify the maximum message size for new mailboxes (those you create in the future).

Current Mailboxes

To edit Current mailbox/es select recipients > mailboxes and select the mailbox/mailboxes. Then go to Mailflow Settings>Message size restriction.

Then message maximum size can be added.