Troubleshooting Error 535 5.7.139 When Sending Email in Outlook
Seeing “535 5.7.139 Authentication failed” when you try to send an email in Outlook can be incredibly annoying. Learn what causes this cryptic error code, how to fix it, and restore your outbound messaging capabilities once and for all! Sending an email seems like it should be one of the simplest things to do on a computer. You open up your mail client, type in the recipient’s address, write your message, and hit send. Email … Read more