For a while I've had trouble with invalid email address 
  "Ville Skyttä <scop@xemacs.org "
getting saved into to my .bbdb file.   This happens on 
messages from Ville, which is has a utf-8 encoded =C3=A4=:
   From: Ville =?utf-8?q?Skytt=C3=A4?= <scop@xemacs.org>
After some amount grovelling through the bbdb code I figured the
invalid email address is caused by mail-extract-address-components
defined in mail-lib/mail-extr.el.

  (mail-extract-address-components "Ville Skyttä <scop@xemacs.org>")
  ==> ("Ville Skytt" "Ville Skyttä <scop@xemacs.org ")

mail-extract-address-components is rather intimidating.   I saw some
syntax table code, so I modified the syntax entries for the
C3 and A4 characters from the utf-8 encoding:
  (modify-syntax-entry ?\Ã "w" mail-extr-address-syntax-table) ;C3/&Atilde
  (modify-syntax-entry ?\¤ "w" mail-extr-address-syntax-table) ;A4/&curren

After I did that I get
  (mail-extract-address-components "Ville Skyttä <scop@xemacs.org>")
  ==>  ("Ville Skytt" "scop@xemacs.org")

Which is almost correct, except for the final character in
the last name.  At least it doesn't produce an invalid email address.

Any suggestions on what would be a more correct fix here?

I'm using 21.4.18 mule on Ubuntu that I built from source.
I'm running XEmacs with LANG=en_US.iso-8859-1.

-jeff

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