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 +++

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