Email Send Problems

Hi, I am new to this forum, been lurking for a while found some great information, but need some help now!Email Send Problems Not sure where to post this........

Have a client using Outlook Express for email, they can receive but cannot send emails from a particular account.
All settings are configured correctly, and can send and receive from a different PC. The email address was in the blocked list on Outlook for some reason, now taken off but still not working.

Not a host problem, no settings have changed on PC but any ideas what else may be stopping the connection on this particular PC to server? Could it be the ISP blocking the connection to send mail?
Any suggestions

Thanks

 

 

 

 

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