When I try to send email through Exchange 2003 via an SMTP connection, I get a strange delay after specifying the recipient. Here is a telnet log, with a redacted domain name: (telnet mail.xxx.com 25)
220 mail.xxx.com Microsoft ESMTP MAIL Service, Version: 5.0.2195.6713 ready at Fri, 16 Oct 2009 09:42:20 -0500 HELO 250 mail.xxx.com Hello [172.16.128.42] MAIL FROM: firstname.lastname@example.org 250 2.1.0 email@example.com....Sender OK RCPT TO: firstname.lastname@example.org
After a delay of a minute or so, (it seems to vary) I get this:
250 2.1.5 email@example.com
Although the exact delay varies, it's always a significant delay.
However, when I repeat this exact same transaction from our intranet server, there is zero noticeable delay. I'm really more of a software developer than an admin, and I just can not figure this out.
Anyone have any idea what could cause this?