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Your message is larger than the size limit for messages
Hi one of my internal user has sent an attachment to other internal user. the user says that he sent only 5MB attachment and it has failed. he received below message Delivery has failed to these r...
hi,
for temporary solution for this issue u can ask user to upload the file/document to oneDrive share the link to the required people
mean while u can check o365 admin portal settings & also please check the file which user required to send through mail by sending to your mail address & cross verify.
If you have access to their Exchange Portal you can perform a message trace and that will give you information on the exact size of the e-mail that was sent.