If you are having problems sending over SMTP between two Exchange servers, you Telnet on the sending server to connect to port 25 on the destination server.
1. Connect to your SMTP server
telnet vanbackup.vanstudents.com 25
2. Sent by a client to identify itself, usually with a domain name, the start of an ESMTP session.
ehlo test.com
250-VanBackup.vanstudents.com Hello [192.168.35.22]
250-TURN
250-ATRN
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
3. tell the receiving SMTP server who the message is from
MAIL FROM: admin@test.com
250 2.1.0 admin@test.com....Sender OK
4.tell the receiving SMTP server whom the message is to:
(After the Subject line, press the ENTER key twice. To end the message, the last line must be with only one dot.) Temporiarily enable the anonymous relay, if SMPT virtual server does not allow the anonymous relay, you will get the error message: unable to relay for phil@eidam.com.
RCPT TO: phil@eidam.com
550 5.7.1 Unable to relay for phil@eidam.com
RCPT TO: phil@eidam.com
550 5.7.1 Unable to relay for phil@eidam.com
RCPT TO: administrator@vanstudents.com
250 2.1.5 administrator@vanstudents.com
DATA
354 Start mail input; end with
Subject: Test Message
This is a test.
.
250 2.6.0
5. To close the connection, type
QUIT
===
Advanced testing
RCPT TO: phil@eidam.com notify=success,failure
Disable the open relay!!
