We run IMAIL with multiple virtual hosts and most mail is delivered no problem. However, when sending to Supanet we get a "550 EHLO argument does not match calling host"
Your IP's PTR domain name must have an A record owning that IP address. ie, the PTR and A record must "match".
The helo/ehlo host name must be FQDN that matches the PTR domain name.
The helo/ehlo name, along with the PTR + A record, represent the machine, not your outbound MAIL FROM: @sender.domain, with which there is no required correspondence.
Your server's SMTP greeting should also list a domain name that matches both the PTR and HELO domain names. Again, none of this has anything to do with the MAIL FROM: @sender.domain. or, for that matter, with the RCTP TO: @recipient.domain for inbound mail to the MX of @recipient.domain.
The above label.domain.com hostname must accept mail to [EMAIL PROTECTED] and [EMAIL PROTECTED]
The above rules have no impact on an IP serving as in/outbound SMTP gateway for any mail domains.
Yesterday, I did a search in the Imail user guide and in the IMail KB, and there is very little info about the how Imail defines the Helo hostname, nor any recommendation or norms that the PTR + A + HELO + SMTP greeting hostnames should all be the same.
iow, you are having trouble getting your mail delivered because your credentials are not in order for an MX that is insisting on full credentials, which are themselves nothing but RFC + "best practices".
Len
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