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Email Attachments Size
Learn mySMTP’s email attachment size limit, how Base64 encoding affects file size, and calculate the real maximum attachment size you can send.
The max file size of email attachments is 25 mb
Meaning the real file size can max be around 18MB due to Base64 encoding, which adds about 33% overhead.
This the equation to use: Max file size = 25 MB / 1.33 ≈ 18.75 MB