Mailer Error

Tasa

Dear Sirs,
We have a large number of these messages:
Unable to email via SMTP:smtp.office365.com:587 [podrska@calculus.rs] Failed to set sender: podrska@calculus.rs [SMTP: Invalid response code received from server (code: 530, response: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [VI1PR0602CA0024.eurprd06.prod.outlook.com])]

What could be the cause and how to fix?

Thanks!

Tasa

Hi Everyone,
Perhaps the solution to the problem is to include authentication?

ntozier

Exchange (O365) says "Client was not authenticated to send anonymous mail during MAIL FROM [VI1PR0602CA0024.eurprd06.prod.outlook.com])"

This tells me that you are either not authenticating, or using an account that isn't authorized to send mail using the address that you specified.