Can't send mail on any servers

Hi -
I am able to receive mail but not send it.
I have 4 smtp servers and none of them will work. I have read everything I could find to fix this. I have deleted the servers using the edit server option and re-entered them.
Does anyone have any idea or suggestions?
Thanks so much!

Hi All
I just spoke with my ISP and the smtp and port settings have been changed. When I changed them on my laptop the problem was resolved. This still doesn't explain why the problem only occurs on the laptop but at least it is working again.

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