There are certain situations where I want to replace the contents of a 
header and not change either the header's name or its position in the 
list of headers.  Accordingly, something like

    del msg["Subject"]
    msg["Subject"] = newsubj

doesn't quite cut it.  For example, de-SpamAssassin-ing a message 
for feeding to GBayes would change the header order (minor change, 
but annoying) and potentially change the actual subject string (some 
spam seems to use "SUBJECT:" instead of "Subject:").

Here's a replace_header method that does what I want.

    def replace_header(self, hdr, newval):
        """replace first value for hdr with newval"""
        hdr = hdr.lower()
        for (i, (k, v)) in enumerate(self._headers):
            if k.lower() == hdr:
                self._headers[i] = (k, newval)

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+1 although I'd like to think some on the method name. 
Also, we'll need a Python 2.1 compatible version of that
method (no "enumerate").   The email package still has to be
Py2.1 compatible.  See PEP 291.

Care to upload a new version?

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How about the attached?  Used zip() instead of enumerate.  I'll let you 
worry about the name... ;-)

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+1 Thanks!

I'll try to get this into email 2.3.

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Added to Message.py 1.21