an email that was sent to my backup MX generated a "Mail loop detected"
error on the backup MX.
here's the setup (using v1.11 on win2000) ...
DNS MX records:
domain1.com -> 10:alias.domain1.com, 20:alias.domain2.com
domain1.com xmail settings:
domain -> domain1.com
domain alias -> alias.domain1.com
domain2.com xmail settings:
custdomain -> domain1.com.tab: "SMTP"<newline>, alias.domain1.com.tab:
"SMTP"<newline>
(plus settings pertaining to domain2.com, but they should not be
relevant, but for those who are interested, they are almost the same as for
domain1.com).
I tested this by telneting to domain1.com:25 and domain2.com:25 and sending
a message by hand (which got through both times ok).
so I thought my backup MX was all ok.
but for a short amount of time on the weekend, domain1.com was offline, and
an email was sent to [EMAIL PROTECTED]
now, here is what I think happened ....
remote server does
MX lookup for domain1.com -> gets 10:alias.domain1.com,
20:alias.domain2.com
attempts to connect to domain1.com:25 -> fails
attempts to connect to domain2.com:25 -> succeeds
domain2.com does
check local domains and domain aliases -> no match
check custdomain -> finds command "SMTP" for domain1.com
MX lookup for domain1.com -> gets 10:alias.domain1.com,
20:alias.domain2.com
attempts to connect to domain1.com:25 -> fails
attempts to connect to domain2.com:25 -> succeeds
domain2.com does the same sequence of steps repeatedly until loop detected.
(each time prepending a bit to the header)
so, have I just setup my backup MX wrong ? (I thought this is how it was
supposted to be setup according to a recent post on this list)
Louis Solomon
www.SteelBytes.com
-
To unsubscribe from this list: send the line "unsubscribe xmail" in
the body of a message to [EMAIL PROTECTED]
For general help: send the line "help" in the body of a message to
[EMAIL PROTECTED]
