Smtp server rejects password for outgoing mail

I can receive, but not send messages from my imac and get the message the SMTP server "smtp.tiscali.co.uk" rejected the password for user ".........".
This has just suddenly started happening. I enter what I know to be the password but it is rejected, so I have to send via webmail (now talktalk, not tiscali) or iphone. I have looked on here before and tried re-entering password/changing the port but to no avail. Flummoxed.

Hello, Fifietta. 
Thank you for visiting Apple Support Communities.
Here is an article that will walk you through some troubleshooting steps that may help with this issue.
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/ts3276
Cheers,
Jason H.

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