[Exim] Newbie: local_domains

Hi

I am trying to specify a dbm file for local_domains in exim.conf as per the
instructions for virtual domains. The dbm file seems to build ok but when I
restart exim using it and try to send a email I get a

421 Unexpected failure, please try later

message right after doing a EHLO command.

For the record this is what I have in my exim.conf file

local_domains = "netconnectpro.co.uk: dbm;/mail/domainsdbm"


TIA

Jon Farmer
Genesis Interactive Ltd