post...@nisny.com:
> >> Trying 17.172.34.70...
> >> Connected to st11p00mm-mx006.me.com.
> >> Escape character is '^]'.
> >> 220 st11p00mm-smtpin012.mac.com -- Server ESMTP (Oracle Communications
> >> Messaging Server 7u4-27.08(7.0.4.27.7) 64bit (built Aug 22 2013))
I made a telnet connection from my own machine without trouble.
What system did YOU make the connection from?
> >> As you can see, I'm getting an immediate 220 from them which postfix
> >> apparently is not getting. I can, of course, continue the telnet
> >> session and send a complete email which is received by the recipient.
> >
> > And so can Postfix. One SINGLE SMTP connection from Postfix is likely
> > to proceed just as well.
>
> Why do you think it's a single connection?
> It's multiple connections from Postfix to multiple servers over
> multiple emails over multiple days
Indeed, the problem is making multiple connections in the past.
Your telnet test was today, making one connection.
You may learn more by capturing a few failed SMTP sessions with
tcpdump.
Wietse
