I should have asked what auth mechanisms you see in the relay EHLO
response? A good way to test this (or any issue with SMTP
communication in fact) is with the swaks tool.
--
Ian
--
## subscription configuration (requires account):
##
https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/
## unsubscribe (doesn't require an account):
## exim-users-unsubscribe@???
## Exim details at
http://www.exim.org/
## Please use the Wiki with this list -
http://wiki.exim.org/