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Outlook express The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was [email protected]'. Subject 'COMPLAINT', Account: 'pop.mail.yahoo.com', Server: 'smtp.mail.yahoo.com', Protocol: SMTP, Server Response: '530 authentication required - for help go to http://help.yahoo.com/help/us/mail/pop/pop-11.html', Port: 587, Secure(SSL): No, Server Error: 530, Error Number: 0x800CCC78


Answers :

0x800CCC78 SMTP_REJECTED_SENDER Unknown sender. This is caused by having the incorrect e-mail address in the Reply-To field.

You may have to authenticate in outlook express by putting in the SMTP server name of your internet provider instead of yahoo
for example
Incoming = smtp.mail.yahoo.com
Outgoing = smtp.yourISPservername
Some isp's will not let you send out with a different smtp server than theirs.
It's why you can receive but not send.
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