Emails sent through the Email Security.cloud infrastructure are larger than expected or emails with attachments under the email size limit are rejected as being too big.
Email was originally intended solely for handling text-based messages. MIME encoding makes it possible to send binary files (non-ASCII text files) such as multimedia files, compressed archives, etc. over the Internet.
Almost all modern email clients support the MIME encoding and decoding process. The MIME process takes binary files and converts or encodes them to a plain text format for the trip across the Internet. The MIME process then decodes or reconverts the plain text back into the original binary format once the email reaches its destination.