appleleaf
appleleaf

Reputation: 927

How to use 8bit encoding in multipart MIME messages in SMTP?

I have a question about how to use 8bit encoding in mulitpart MIME in SMTP. Per MIME Wiki, we can specify value of "Content-Transfer-Encoding:" as 8bit. For such condition, do we need to use 8bit MIME extension for SMTP?

Upvotes: 0

Views: 652

Answers (1)

Yes. You can only use Content-Transfer-Encoding: 8bit with an SMTP server that supports the 8BITMIME extension.

In RFC 2045 section 6.2, it says "Mail transport for unencoded 8bit data is defined in RFC 1652".

RFC 1652 (obsoleted by RFC 6152) describes and defines the 8BITMIME extension. While I don't see a specific sentence to quote to you, the entire document assumes that if you're sending 8bit data, that you're using the 8BITMIME extension.

I haven't seen anything to the contrary.

Upvotes: 1

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