Thanks for your interest. Yes, I figured out where the mail.log actually was, and here's what it says with specific relation to these remote telnet connections.
Quote:
Jun 15 19:39:33 ubuntu postfix/smtpd[5124]: NOQUEUE: reject: RCPT from remotecomp.ourdomain.com[192.168.150.135]: 554 5.7.1 <address@ourdomain.com>: Relay access denied; from=<address@ourdomain.com> to=<address@ourdomain.com> proto=ESMTP helo=<localhost>
Jun 15 19:44:33 ubuntu postfix/smtpd[5124]: timeout after RCPT from remotecomp.ourdomain.com[192.168.150.135]
Jun 15 19:44:33 ubuntu postfix/smtpd[5124]: disconnect from remotecomp.ourdomain.com[192.168.150.135]
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Doesn't seem to provide more useful information.