[Exim] 8 bit characters in email addresses

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Autor: hoh
Data:  
A: exim-users
Assumpte: [Exim] 8 bit characters in email addresses
Hello.

Many Swedish names use characters outside the a to z and this has
always been a problem in email addresses. The usual method is to
replace the "bad" characters with a similar looking "good" character.
Sometimes a user forgets this and tries to send mail with a unusable
destination address.

Example:

User enters t.täuber@their_domain.se and the users email client
puts this To:-header

    To: =?iso-8859-1?Q?t=2Et=E4uber=40their_domain=2Ese?=


in the mail. The To:-header is then qualified and lowercased by
Exim to

    To: =?iso-8859-1?q?t=2et=e4uber=40their_domain=2ese?=@our_domain.se


resulting in confused users when they look in the headers of
the bounced email.

Is there any easy way to detect badly formed email addresses in Exim
and reject the email or should the users be modified instead?

--
Göran Larsson     hoh.mitt-eget.com