Is an email with different character encoding for it's header and body valid? The Use Case: While processing an email, should I check for the character encoding of it's header separately, or will checking that of it's body be sufficient? Can someone guide me as to how to figure this out? Thanks in advance!
Can an email header have different character encoding than the body of the email?
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Email headers should use the ASCII charset, if you want the header fields to have a different encoding you need to use the encoded word syntax: http://en.wikipedia.org/wiki/MIME#Encoded-Word
The email body can be directly encoded in different encoding only if mail servers that transfer it have 8bit mime enabled (nowadays every mail server should have it enabled, but it's not guaranteed), otherwise you need to encode the body in transfer encoding (quoted-printable or base64)
The charset can be different in each case, that is you can have every encoded word in different charset and every mail part encoded in different charset or even different transfer encoding as well.
For example you can have:
and the body encoded:
different charsets, different transfer encodings in the same email, no problem.
From experience I can tell you that such mails are very common. Even worse, you can get an email that states one charset in Content-Type header and another charset in html body meta tag:
It's up to you to guess the actual charset used. Probably it's the one in meta tag.
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