Comments on: Telnet to port 25 to Test SMTP communication http://blog.connexeon.com/sysadmin/windows/telnet-to-port-25-to-test-smtp-communication/ Connexeon Blog Mon, 16 Jan 2012 12:14:21 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Tom Van den Berg http://blog.connexeon.com/sysadmin/windows/telnet-to-port-25-to-test-smtp-communication/comment-page-1/#comment-1439 Tom Van den Berg Mon, 28 Dec 2009 10:13:29 +0000 http://sysadmin.blog.connexeon.com/?p=125#comment-1439 To test an IMAP connection, telnet to port 143. telnet mail.domainname.tld 143 You'l get a response like this: # telnet mail.domainname.tld 143 Trying xxx.xxx.xxx.xxx... Connected to mail.domainname.tld (xxx.xxx.xxx.xxx). Escape character is '^]'. * OK The Microsoft Exchange IMAP4 service is ready. To test an IMAP connection, telnet to port 143.

telnet mail.domainname.tld 143

You’l get a response like this:

# telnet mail.domainname.tld 143
Trying xxx.xxx.xxx.xxx…
Connected to mail.domainname.tld (xxx.xxx.xxx.xxx).
Escape character is ‘^]’.
* OK The Microsoft Exchange IMAP4 service is ready.

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