Outlook Express/Comcast: can't send email to self

After years of normal operation, my Comcast email suddenly stopped working -  neither I nor my wife, on our respective computers, could send or receive email via OE. After a number of tech support sessions, Comcast performed some (unspecified) fix and we were again able to send and receive, except for one remaining issue: Neither I nor my wife, on our respective computers, are able to send email to ourselves. We get the error message:

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The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'anon@comcast.net.'. Subject 'test', Account: 'mail.comcast.net', Server: 'smtp.comcast.net', Protocol: SMTP, Server Response: '550 5.5.0 <anon@comcast.net.> domain missing or malformed', Port: 587, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79
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Comcast has been unhelpful on this. Any suggestions would be appreciated.
dgmoore1Asked:
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jcimarronCommented:
dgmoore1--Perhaps of help
http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.windows.inetexplorer.ie6_outlookexpress&tid=1d309bc2-0a90-4a28-985a-dbf1ea903870&cat=&lang=&cr=&sloc=&p=1  Bottom line is to create a new identity.
This also could be because your accounts have been blacklisted, though it is strange Comcast would not look into that.  Can you receive emails sent by your wife to you and does she receive those sent by you to her?
I use OE on Comcast.  My outgoing (SMTP) port is 25 and the incoming port (POP3) is 110.  Port 587 can sometimes be used for outgoing mail.  See what port is set up for sending mail on your PC's.  OE Tools|Accounts|Properties|Advanced tab.
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dgmoore1Author Commented:
Creating a new identity under Windows did the trick. It's not clear to me why this is, but neither do I want to argue with success!
Thanks for the tip.
Dave
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jcimarronCommented:
dgmoore1--You are most welcome.  I, too,  have never understood why creating a new identity solves so many problems in OE.
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