[Dovecot] RFC 2822 - message-id

[Tom Allison]

I was porting some email from one imap server location to another and ran into a 
feature of something.  One of them writes message-id as 'Message-Id' and the 
other writes it as 'Message-ID'.  Because of this, all the messages are forever 
different.

All mail is delivered from postfix and will be in the future.

But I'm asking which of these syntaxes is correct or if there is a right/wrong 
way of writing the headers?  RFC2822 doesn't come right out and say it, but all 
the examples therein are "Message-ID".

RFC 822 says they are all the same.

Both?