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Sumesh1980's avatar
Sumesh1980
Copper Contributor
Aug 30, 2020

Not able to configure "Send mail as" On Gmail

Hello, 

 

I want to configure Gmail (using their "Send mail as:" feature) to send mails through my business Office365 Outlook account, , but when I try to connect it I get an Authentication failed message from the Office 365 server with an error message like this:

 

Authentication failed. Please check your username/password.
Server returned error: "334 VXNlcm5hbWU6 334 UGFzc3dvcmQ6 535 5.7.3 Authentication unsuccessful [SN6PR01CA0011.prod.exchangelabs.com] , code: 535"

 

I can sign in to Outlook Web App without problems using the same credentials.

 

Below is the screenshot for the same 

 

Can some help me to fix this issue 

microsoft 365
  • sebastianpereira's avatar
    sebastianpereira
    Copper Contributor
    Mar 12, 2021
    Hola, Office 365 con SMTP usa STARTTLS para autenticar, creo que en Gmail debes usar la opción de SSL.
    Espero te ayude.
    Saludos.

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