If you are facing this error while sending emails via Microsoft Outlook.Please Use the following 3 easy steps for complete solution in your Outlook version 2010 or later, We hope this trick will Absolutely solve your issue.
1-Click File > Info > Account Settings
2-Select Account > Change
3-More Settings > Outgoing Server >
Click on ai???More settingsai???
ai??? Select ai???Outgoing Serverai??? Tab
ai??? Check ai???My outgoing server (SMTP) requires authenticationai???
ai??? Select ai???Use same settings as my incoming email serverai???
ai??? Click OK
ai??? Press Next
ai??? At Last, press Finish
Problem Solved Successfully!
Donai??i??t Forget to like our facebook Page for more Tips & Tricks !