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k-9 e-mail

Got the K-9 e-mail app since the android standard wasn't getting it but I'm with US Cellular and I can recieve e-mail but when I try to send I get a message saying that I can't send to that address. Any advice?
Your outbound settings aren't correct or your email provider isn't allowing you to use their SMTP server. Double check your settings. Verify with your email provider.

It's not uncommon for ISP's to not allow the use of their SMTP server if not on their network as an anti-spam feature. Some mail providers allow the use of their SMTP server but require proper authentication.
 
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