Setting up a second email address in Outlook

I have a user that has several emailaddresses set up through outlook.  His HDD expired and I rebuilt his machine using the same Outlook.pst file and the same version of windows / office.  However one of his emails (from a privately purchased domain name) is not able to  send emails out.  Recieving is ok .  I have checked the smtp details with the private company and the ones that we have entered are correct.  His PST file is quite large at 1.8gb but not causing a problem just yet.  Any ideas??
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If he sends via SMTP rather than MAPI (straight to the internet rather than via exchange) then it's likely that McAfee AV or firewall is blocking port 25.  it could also be that his ip address has changed and so the corporate firewall is blocking SMTP from his machine.
What error message do you get. If this is private it may be that you are getting a relay error. It may have only worked from a particular internet connection, such as from his house
Mike_HeanueAuthor Commented:

This is the exact error message.  

Task 'imap.************* Folder:Sent Items Check for new mail.' reported error (0x800CCC0E) : 'Outlook is unable to download folder Sent Items from the IMAP e-mail server for account imap.************** Error: Unable to connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'
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does the machine has the same IP address as previous?
You may well need authentication on the outgoing email. Have you tried turning this feature on within the account settings.
The following site has various "fixes" for this problem. This may well help.

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Mike_HeanueAuthor Commented:
Guys, I think the IP adress must have changed as the pc was down for about 1 month and I am guessing that the parent server is using DHCP with the default settings of 8 days for a lease.  
If this is the case then whats the best thing to do?  Get the ISP to test the send/recieve from their end??
firstly can you ping the server? Or at the very least, resolve it's name.

I doubt the issue is with the host more likely something on your network not allowing the connection from the new IP to the server. Corporate firewall?
Mike_HeanueAuthor Commented:
We can ping the server.
can you telnet the server on port 25 from command prompt
"telnet 25" is the command you'll need
Mike_HeanueAuthor Commented:
Thanks guys.  I had to refer the user to their ISP.  

Many Thanks.
Mike_HeanueAuthor Commented:
Not the exact solution but a helpful ball park guide
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