I have had a user-reported problems mailing the following
user@???
The nslookup for that address gives
mail.ap-hm.fr preference = 5, mail exchanger = clust1.ap-hm.fr
mail.ap-hm.fr preference = 10, mail exchanger = clust2.ap-hm.fr
mail.ap-hm.fr preference = 15, mail exchanger = timomal2.ap-hm.fr
mail.ap-hm.fr preference = 20, mail exchanger = mail.ap-hm.fr
mail.ap-hm.fr preference = 0, mail exchanger = srvmail.ap-hm.fr
mail.ap-hm.fr internet address = 194.199.241.2
the MX records pref 0,5,10,15 all fail to lookup and the pref 20 is to
itself an A record. This address accepts mail (telnet port 25).
The user claims that it gets through from an ISP but not here, so does EXIM
do anything that would stop it working e.g. limit the number of MX records
tried.
John Linn