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2.24.7.4. Maximum letter size

The maximum size of a sent letter is 50 MB.

Important points

  • The SMTP protocol does not support the transfer of binary data and for this it encodes all attached files according to the algorithm Base64, which increases the message size by 1.5-2 times.
  • Not all email services are capable of accepting letters of this size (for example, in Gmail, the size of a letter should not exceed 25 MB).