cannot send Email, can receive

Try going to Mail preferences>account information, at the bottom outgoing mail server (SMTP) is not set to none, and is set to your email provider server.

The fix is here for iphone http://www.emaileverywhere.co.uk/cannot_send_email_iphone.html

and here for ipad - http://www.emaileverywhere.co.uk/cannot_send_email_ipad_tablet.html

I had problems for ages and then downloaded their step by step guide for $2

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