In MFORMULA, you can send and receive messages up to 10 megabytes (MB) through an e-mail program, however the precise size allowed depends on the attachment.
When you add an attachment, the file size may increase because the transport encodings are automatically added. (Transport encodings are information that allows your messages to be sent and read safely.)
This means that, in some cases, 5 to 10 MB attachments can increase the overall message size to more than 10 MB.
Via WebMail the allowed attachment size is 10 MB.