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I can receive email but not send
I have two email accounts I'm using as pop3 in this fantastic Outlook Express (GMX and Outlook) in Windows 7 - OE receives email through them but won't send.

I think I have the right settings, have checked and re-checked - for SMTP I've tried 25, 465 and 587.

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The error message I'm getting:

The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was ''. Subject 'follow through', Account: 'OUTLOOK', Server: '', Protocol: SMTP, Server Response: '530 5.7.1 Client was not authenticated', Port: 587, Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC78
For now I figured out how to use my ISP's smtp server, works like a charm, but not sure this would be okay with my server for long, but great in the mean time, until I can learn what the problem is with my outgoing OE mail.

I can hardly believe I have Outlook Express on Windows 7, and I owe it all to this site, and I thank you very much!
From what I see it all comes down to Outlook Express does not have STARTTLS.

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