exim wierdness

[Rohan Nicholls <rohan.nicholls@informaat.nl>]

I am finding a problem with exim.

I have read many a manual, visited many a documentation site, with no 
joy.  Could anyone please point me in the right direction....

If I have an email with a '.' in the "localhost" name (before the '@') 
it gives an error that the "localhost" name is invalid.

This does not happen when the "localhost" name has no '.'.

So:

rohannicholls@informaat.nl - no problem (although this address doesn't 
exist)

rohan.nicholls@informaat.nl - gives an error.

This is a little urgent as I would like to use exim as my smtp mailer, 
because it doesn't mind if I am at work or at home it still delivers mail.:)

But all the mail addresses at work involve the 
first-name.last-name@domain.end protocol, so I cannot send any mails to 
coworkers using mutt.

Thanks in advance,

rohan