Halloo Oscar,
> .ifdef HELO_ALLOW_CHARS
> helo_allow_chars = HELO_ALLOW_CHARS
> else
> default set helo_allow_chars = _
> .endif

I have just tested the following on in my exim configuration:


helo_allow_chars = _

(no macro necessary)


~$ sudo update-exim4.conf
~$ exim4 -bh 146.232.129.15

...
220 werkesel.sun.ac.za ESMTP Exim 4.68 Mon, 26 Nov 2007 14:39:33 +0200
ehlo ek_is_hier
>>> host in pipelining_advertise_hosts? yes (matched "*")
>>> host in auth_advertise_hosts? yes (matched "*")
>>> host in tls_advertise_hosts? no (option unset)
250-werkesel.sun.ac.za Hello stbnwcss.sun.ac.za [146.232.129.15]
250-SIZE 52428800
250-PIPELINING
250 HELP

Regards
Johann

-- 
Johann Spies          Telefoon: 021-808 4036
Informasietegnologie, Universiteit van Stellenbosch

     "In the beginning God created the heaven and the  
      earth."                     
                           Genesis 1:1

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