Unable to send email to own domain - Outlook 2003

I am running Outlook 2003 Professional on a Windows XP Platform.
When sending mail to a certain domain, the email sits in my Outbox and just won't send.  Mail to all other domains sends fine - no hassle.
All the users sitting in this office are having the same issue - and the domain that is causing the issue is our own.  We have users in another office who are able to send emails to us from their accounts on this domain, but we are unable to reply - the email just sits in our outbox.
We are running Mcafee Security Centre - where the other office is running Sophos.  Is there anything in Mcafee that could be causing the issue?  And if so, how does one get around it?
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idsafsAsked:
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war1Commented:
Greetings idsafs,

Yes, McAfee Security Center can do this.  In McAfee Security Center, allow your domain to get through the seurity center.

Best wishes, war1
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idsafsAuthor Commented:
I have added the domain, and it still does not work.  I have since totally removed McAfee from my machine and the issue persists.
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dr_shivanCommented:
Is your mail server settings correct?
Are both the offices pointing to the same mail server? If it isn't there should be some misconfiguration on your mail server to resolve its own domain.
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AimToPleaseCommented:
Maybe your MX records are wrong. Go to www.dnsstuff.com, scroll past the banner thingie and try a DNS lookup of the MX records for your domain. They should point to McAfee security centre.
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idsafsAuthor Commented:
MX Records are correct, as are the mail server settings - as I said, we are able to send and recieve mail from any/everwhere else - it is just sending mail to users on the same domain that is an issue.
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AimToPleaseCommented:
Does that mean that this type of e-mail stays within your mail server?
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idsafsAuthor Commented:
It does not even leave the outbox of the mail client.
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AimToPleaseCommented:
I'm sorry.

What I meant to ask was: is this mail supposed to stay within the e-mail server or should it be routed to another mail server?

What type of mail server are you using btw?
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idsafsAuthor Commented:
It is in the same email server - they are POP accounts hosted by our ISP.  I am not sure what the server is.
I have jsut had a look at the error messge again - not sure how I missed it - and it is giving the "503 Valid RCPT Command must precede data” error.
All users have the "My outgonig mail server (SMTP) requires authentication" box ticked at the moment, so there is something else that is causing ths issue.
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AimToPleaseCommented:
Do all users also have the setting "Use Same Settings As Incoming Mail Server" ticked? Are these credentials actually the same?
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idsafsAuthor Commented:
All users have this ticked - all credentials are the same.  I have also tried using the "Use these details" and re-entering the username and password in the block provided.
The users in the two offices are setup exactly the same, all using Outlook 2003.  Yet only the users in one office are experiencing the issue, and it is only when sending mail to our own domain - we can send email to anywhere else, which is strange...
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idsafsAuthor Commented:
We have resolved this issue - it turned out that the Dynamic IP assigned to us by our local ISP had been flagged for SPAM by the mail server - hence whenever we sent emails to that address it was being flagged as SPAM.  The mail server had been configured to give that 503 error to all SPAM.
All sorted out now, many thanks for all the responses and help.
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Computer101Commented:
PAQed with points refunded (500)

Computer101
EE Admin
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