What are the attachment limits for MyMail?
Attachments can be no larger than 20 megabytes in size after transport encoding. Typically attachments 15 megabytes and smaller will encode and be delivered to your MyMail mailbox without any problems. Attachments between 15 and 20 megabytes MAY be larger than the allowable limit after it is encoded for transport between mail servers. It is good practice to keep messages under 15 megabytes in size.
