Our primary mx is exim 3.16 and I am having trouble with a remote
host rejecting my mail. The receiving host is running exim 4.43 (yes
the same host as in my last mail).
the error is:
SMTP error from remote mailer after MAIL
FROM:<dermot@???> SIZE=1762: host mail.theirdomain.com
[ipadd]: 451-Could not complete sender verify callout\r 451-Could not
complete sender verify callout for <dermot@???>.\r 451-The
mail server(s) for the domain may be temporarily unreachable, or\r
451-they may be permanently unreachable from this server. In the
latter case,\r 451-you need to change the address or create an MX
record for its domain\r 451-if it is supposed to be generally
accessible from the Internet.\r 45 Talk to your mail administrator
for details.: retry timeout exceeded
If I use my exim 4.43 test server, all is well.
According to the admin of the remote server:
"One thing, yourmailserver does not give mymailserver an smtp banner
(ESMTP Exim 3.16 #3 Fri, 04 Mar 2005). However it does give other
hosts the banner."
Could this be the reason for the sender verify failing? If so does
anyone know why a banner is not sent for a particular host? I know
that the exim version is old. I have an upgrade planned for later
this year but in the meantime I want to keep the service going.
