I dug around online and found info regarding mail, port 25, and port 587. Got a little better idea what all this is about and I decided to try some permuations Though I didn't get any mail sent, I was able to get a failure message back which is more info than I've seen before. In sendmail.mc, I did the following: +++ dnl #DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl +++ After making and restarting, I fired off an email from chowder (192.168.2.11) to chalupa (192.168.2.10) and then got the following when running mail (see below). Also, telnet chalupa works on port 25 and 587. The netstat command shows listening on 0.0.0.0:25 and 0.0.0.0:587 /etc/mail/access has 192.168.2 added (and I did try 192.168.2.0/24 in case it wanted that form). It appears that mails to self gets blocked if I don't have both the smtp and submission line active (???). I have iptables stopped and, given that I've gotten email that the Linksys router doesn't have any blocking control on LAN communications, only internet, I've got my router back to normal firewall configuration. What I am hoping is that someone will spot what the blocking issue is from the returned email (#2). I've done some looking online but am currently drawing a blank. Thanks again for everyone's help, Paul ps: the original message in the email was a line of "+++", a cut-n-paste of the mail command, and a closing "+++" +++ running mail +++ [paul@chowder ~]$ mail Heirloom Mail version 12.5 7/5/10. Type ? for help. "/var/spool/mail/paul": 2 messages > 1 Paul Allen Newell Sun Aug 21 18:17 24/897 "chowder to chalupa as" 2 Mail Delivery Subsys Sun Aug 21 18:17 73/2566 "Returned mail: see tr" & 1 Message 1: From paul@localhost.localdomain Sun Aug 21 18:17:33 2011 Return-Path: <paul@localhost.localdomain> From: Paul Allen Newell <paul@localhost.localdomain> Date: Sun, 21 Aug 2011 18:17:32 -0700 To: paul@chalupa.localdomain Subject: chowder to chalupa as paul 21aug11 18:17 Cc: paul@localhost.localdomain User-Agent: Heirloom mailx 12.5 7/5/10 Content-Type: text/plain; charset=us-ascii Status: RO +++ [paul@chowder ~]$ mail -s "chowder to chalupa as paul 21aug11 18:17" -c paul paul@chalupa +++ & 2 Message 2: From MAILER-DAEMON@chowder.localdomain Sun Aug 21 18:17:33 2011 Return-Path: <MAILER-DAEMON@chowder.localdomain> Date: Sun, 21 Aug 2011 18:17:33 -0700 From: Mail Delivery Subsystem <MAILER-DAEMON@chowder.localdomain> To: <paul@localhost.localdomain> Content-Type: multipart/report; report-type=delivery-status; boundary="p7M1HXNR011003.1313975853/chowder.localdomain" Subject: Returned mail: see transcript for details Auto-Submitted: auto-generated (failure) Status: RO Part 1: The original message was received at Sun, 21 Aug 2011 18:17:32 -0700 from chowder [127.0.0.1] ----- The following addresses had permanent fatal errors ----- <paul@chalupa.localdomain> (reason: 530 5.7.0 Authentication required) ----- Transcript of session follows ----- ... while talking to chalupa.localdomain.: >>> MAIL From:<paul@localhost.localdomain> SIZE=815 <<< 530 5.7.0 Authentication required 554 5.0.0 Service unavailable Part 2: Content-Type: message/delivery-status Part 3: Content-Type: message/rfc822 From paul@localhost.localdomain Sun Aug 21 18:17:32 2011 Return-Path: <paul@localhost.localdomain> From: Paul Allen Newell <paul@localhost.localdomain> Date: Sun, 21 Aug 2011 18:17:32 -0700 To: paul@chalupa.localdomain Subject: chowder to chalupa as paul 21aug11 18:17 Cc: paul@localhost.localdomain User-Agent: Heirloom mailx 12.5 7/5/10 Content-Type: text/plain; charset=us-ascii +++ [paul@chowder ~]$ mail -s "chowder to chalupa as paul 21aug11 18:17" -c paul paul@chalupa +++ & q Held 2 messages in /var/spool/mail/paul [paul@chowder ~]$ +++ end +++ -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines