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An unknown error has occurred. Account: 'mail.julian.li', Server: 'mail.julian.li', Protocol: SMTP, Server Response: '421 Too many concurrent SMTP connections; please try again later.', Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67
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Its taking 5 mins to access the smtp server to send a email, why dont you increase the amount of connections allowed for paid users?

The email eventually sent about 5 minutes later. If I try to send using the exact same  settings using my isp's smtp mail server, its instantaneous.

Julian
www.julian.li