Somehow I think my point was missed - the real reason they were blocking is that the sending server doesn't have port 25 open to the public! The sending server was also not the MX server. (The helo was/is just fine - they just can't get it except from our MX listed server). They are not doing a callback based on the MX record, but instead on the sending IP. They evidently don't use spf records either.
I understand why they are doing this - it just is not in the RFCs (yet?). In a way I agree with them - there needs to be some system of authentication between MTA to MTA communications. There really needs to be a new standard - I hope it isn't left to M$ to set it. ---------------------------------------------------------------- Karl Schmidt EMail [EMAIL PROTECTED] Transtronics, Inc. WEB http://xtronics.com 3209 West 9th Street Ph (785) 841-3089 Lawrence, KS 66049 FAX (785) 841-0434 ---------------------------------------------------------------- -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
