Email data size exceed error

I am getting a “552 5.3.4 email data size exceed” error on email routing while transferring a file of 20MB. Cloudflare claims that the email data size limit is 25Mib however I am getting this error on emailing file less than 25Mib too.

Your message size will be about 35% bigger than your file size due to MIME encoding so 20MB binary file attachment will be over the limit.

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So what would be the actual file size I can mail? Or there’s any way to fix this encoding?

The biggest file would be around 18-19MB, it can vary depending on the encoding and other message content.

As email is a text-only protocol, binary files have to be encoded which increases the size. This applies to any mail server.

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