windows 8 intermittent email problems

[Broadback]

Frequently when sending an email message I get a send error:

Sending of message failed.
An error occurred sending mail: SMTP server SMTP.outitgoes.com is unknown. The server may be incorrectly configured. Please verify that your SMTP server settings are correct and try again.

After a while it will work, this sometimes takes a few minutes of fails again.
I cannot ascertain the problem, it is driving me mad!

It always works fine  on newsgroups, so it must be something to do with my set-up on mail. However it is identical to when I used Windows 7 with no problems.
Any suggestions welcomed, even if it is to tell me I'm thick!

[Simon]

Haven't we had this before?  What's the email client (or is it webmail), and who / what is the service provider?  Maybe you need to be asking them if they're having problems with their smtp server?

[Lance]

Either a DNS error, or a server error I reckon.