Can someone help. I can't send emails, its saying that it requires 'authentication'.??

Mail
1

Really need to send critical email that have a time deadline and it won’t let me-

2

Hello Michelle,

We’re sorry for the inconvenience. Could you please tell us who is your e-mail provider (Gmail, Yahoo, …), how is your account set up? Please post a screenshot of Menu ->Tools -> Accounts - relevant account’s SMTP and IMAP or POP3 tab.

Thank you,
Maurice