Slow or no email but only from single domain

[InnerChild]

So I seem to be having a weird problem, been running Plesk now without updates or anything else for about 8 months. Everything has been fine and now in the last few days I seem to be having a weird problem. If I send a email to myself it can take upwards of 10- 20 minutes before it is delivered. Now is someone else in the company emails me I may not even get it.

So the twist is if I email someone else they get it right away or if they email me there is no problem. Nothing on the server has changed but I have this new problem.

One thing I have noticed that probably indicates that it isn't a Ples thing is that I can login to webmail and the emails seems to deliver but if I am using Outlook there is problems. So I guess this is a Outlook problem I have.....

Any suggestions?

Thanks,

IC

 

[jamesyeeoc]

On the client PC, try disabling any/all firewalls and antivirus/antispyware/antispam/antiadware programs (just to do short time testing) and run a couple of quick tests to see if any of them are the source of the problem.