can't sent text from PC

Can’t send text messages from PC to cell phones when using eM Client. Comes back as message cannot be sent.

I can receive them from cell phones though.

Also can text from PC to cell using Outlook Express - just not eM Client. Anyone offer resolution to this frustrating issuse? If you could copy response to “cato0212@iowatelecom.net” it would be greatly appreciated.

Note: Don’t include the quotation marks