Outlook problem: Replies won't send, new emails do

[ClickHere2Surf.com]

Since this morning all my replies have been "piling up" in my outbox in outlook, it keeps saying failed to conenct to <my mail server>.

Ignore original version of this email, emaisl that were being sent were using another mail server.

What could be causing this? I have many users waiting for their replies.

Thanks

[Zonie]

Are the emails you are replying to addressed to your web mail account or alternate account? When you send a new email, is the smtp the same as the reply?

[ClickHere2Surf.com]

I changed it to use my ISP's SMTP for all accounts and it now works

Thanks

[HeddaLora]

Exactly what I was going to suggest! I ran into a similar problem last night.