Question: what are yahoo incoming and outgoing mail servers?
Answer: POP3 incoming mail server: pop.mail.yahoo.com (port 995, requires SSL)
IMAP incoming mail server: imap.mail.yahoo.com (port 993, requires SSL)
SMTP outgoing mail server: smtp.mail.yahoo.com (port 465 or 587, requires SSL)
NEWS server: news.yahoo.com.