Attachment in email
Email is an extraordinarily bad idea for sending through large files. That’s why most MTA’s enforce a 5MB limit. All email must be sent in ASCII text. When you try and send a binary file in email it has to be encoded into BASE64 which can increase the size of the actual email sent from anything to 2x to 10x the size of the original file.
You should only be using protocols for what they are intended, and large file transfers should always be done via FTP (or derivatives).
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