In this situation, I have a email server emailhost.hostname.com. which its outgoing message had been queue up. I wonder where is the cause of the problem? the email server act up? firewall blocking the outgoing mail? or DNS problem?
From my email address which is admin@hostname.com I am trying to send a test message to sender@hostname.com (assume that sender is a external email address. like hotmail, gmail etc.)
From DOS prompt, type the exchange server host name with the SMTP port 25: (command line input as underline text. )
telnet emailhost.hostname.com 25
220 emailhost.hostname.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.3959 read
y at Thu, 29 Jan 2009 01:09:30 +0000
ehlo
250-emailhost.hostname.com Hello [219.123.123.11]
250-TURN
250-SIZE
250-ETRN
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-8bitmime
250-BINARYMIME
250-CHUNKING
250-VRFY
250-X-EXPS GSSAPI NTLM LOGIN
250-X-EXPS=LOGIN
250-AUTH GSSAPI NTLM LOGIN
250-AUTH=LOGIN
250-X-LINK2STATE
250-XEXCH50
250 OK
mail from:admin@hostname.com
250 2.1.0 admin@hostname.com....Sender OK
rcpt to:sender@hostname.com
250 2.1.5 sender@hostname.com
data
354 Start mail input; end with <CRLF>.<CRLF>
subject:test email from admin to sender with rDNS ON
now we will see....
.
250 2.6.0 <admin@hostname.com> Queued mail for deliv
ery
If everything goes, the sender will receive a email from admin@hostname.com subject: test email from admin to sender with rDNS ON.. with a body of message as "now we will see."
If the message does not go through it will display additional line of message from the telnet window to tell me where this test message has been stopped.