Nov 06, 2014 · Personally, I have 5+ accounts with different email service providers, including Yahoo, Gmail, Cox, my office email address, my website email, etc, etc. Currently, I use Outlook to check all of my accounts from one client application since it makes it easier to manage. If you’re ok with Outlook, then you have no problem.
Verify the correct SMTP Server is being used. In the Thunderbird menu bar, click the Tools Edit menu and select Account Settings, or click the Application menu button and select Options Preferences and Account Settings from the sub-menu, and select the account name. Verify that you are using the right SMTP server for the email address.