Has to be changed in the registry because it reads from the OHN. http://support.ipswitch.com/kb and search for "change official".
When hacking the above, To repeat my earlier advice:
1. An IP of a.b.c.d must have a unique PTR label.domain.tld (and should not be a 2-label domain.tld).
d.c.d.a.in-addr.arpa. PTR label.domain.tld.
2. label.domain.tld must have a A record that matches (to prevent PTR hostname forgery):
label.domain.tld. A a.b.c.d
(My) recommended best practice would be KISS, and simply repeat the above DNS settings for these two SMTP settings.
3. HELO should match PTR hostname:
HELO label.domain.tld
4. SMTP greeting text should match PTR hostname:
220 label.domain.tld.
The above settings have no relation with or dependence upon any envelope sender/recipient domains that transit the IP, nor with any MX records.
Since the "mail" label is vague and useless and could screw you up later so badly that you will have extreme difficulty unscrewing yourself, every domain should elaborate functional labels:
mx1 A a.b.c.d ; MTA relay mail here pop A a.b.c.d ; for users' mail program POP server smtp A a.b.c.d ; for users' mail program SMTP server submit A a.b.c.d ; for users' mail program SMTP server imap A a.b.c.d ; for users' mail program IMAP server webmail A a.b.c.d ; for users' webmail server
NOTE: _NO_ "mail" label anywhere.
"One of these days", Imail should be able to listen on more than one port simultaneously, so port:25 could be exclusively for MX SMTP relaying (MTA to MTA), and port:587 would be exclusively for authenticated-only SMTP mail submission (authenticated user/MUA submits mail to Internet).
Len
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