Trying to connect to yahoo account through Facebook Account

SOURCE: my Incredimail account all of

What opperating system do you have,
Windows XP or Vista? Just courious incase I need to help you further.

Bring up Incredimail and click on tools.
Click on Accounts.
Then on the right side click on remove.
Next click on Add.
This will bring up another window and click on the Automatically Configure Settings.
Then just follow the instructions.
(What I think is that some how your e-mail settings have been changed. Hopefully this will help.)
When finished it should work. If it doesn't I will assist you further. If I could talk to you it would be so simple to get it working for you. Bud

SOURCE: Yahoo mail won't open can someone please help me?

Empty your Temp files, cookies. Use Ccleaner to empty all the Cookies and IE/Firefox temp files. Good luck

SOURCE: halifax.co.uk website - I can login but the minute

sounds like you have done most the right things, you could try another browser see if that helps, if your using Internet explorer try google or firefox etc see if that does the trick
update your anti virus and anti spyware and run them first too
hope this helps a little let me know if i can help further

SOURCE: How can I solve a HTTP 400 BAD REQUEST ?

This is a known problem with earlier versions of microsoft .net framework. Click this link to get the latest version: http://msdn.microsoft.com/en-us/netframework/aa569263.aspx

SOURCE: Message could not be sent. Server rejected sender's email address

the message could not be sent because it rejected as the sender