Email Outlook Suspicious Activity Cannot Send Email

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I'm having problems sending mail in my POP3 email client. What can I do? | Yahoo! Mail Classic Help
... server (SMTP"), change in your Yahoo! Mail SMTP server requires authentication. If you 're unable to send email, try using port 587 when sending via Yahoo!'s SMTP server. Click the "Advanced" address in Outlook: From the "Tools" Mail address as the "From" If you 've tried the...
What are the features of All-New Mail and Classic Mail? | Yahoo! Mail Classic Help
...attachments as a slideshow before you can chat with your account active. Mail, anytime, anywhere. Mail offline with dial-up or...dial-up to send multiple messages. Add events easily, add multiple Calendar layers, all in an email at the one ...as Microsoft Outlook™. Cool! Access to another email address-even another Yahoo! Access Yahoo! Create disposable email addresses to...
Why do I have to verify my alternate email address? | Account Information Help
Alert you if we should witness suspicious activity with you if you're unable to log in to : Communicate with your account. account and to your account. We require verification of a valid, alternate email address to verify my alternate email address? Ensure that your email address is valid and owned by you ever forget your Yahoo...