I’m trying to send an email with our Laravel app using Office365/Outlook. It has worked well with gmail but when I switched over to Office365, the following error appears:
Failed to authenticate on SMTP server with username
“[email protected]” using 2 possible authenticators. Authenticator
LOGIN returned Expected response code 235 but got code “535”, with
message “535 5.7.3 Authentication unsuccessful
“. Authenticator XOAUTH2 returned Expected response code 235 but got code “535”, with message “535 5.7.3 Authentication unsuccessful
This is what I have in my .env file:
MAIL_DRIVER=smtp MAIL_HOST=smtp.office365.com MAIL_PORT=587 [email protected] MAIL_PASSWORD=emailPassword MAIL_ENCRYPTION=tls MAIL_SMTPAuth=true MAIL_FROM_NAME=CompanyName [email protected]
*note: this is not the real username, password and from address.
I also tried changing the port to 25 but I get the same error
I’m using a dedicated support email from my company. And from what I confirmed with our IT, the support email does not have 2 factor authentication and the “Authenticated SMTP” setting is also enabled via the admin panel of Office365 so I don’t know what seems to be the problem.
Keep in mind that for the new tenants, Microsoft turns SMTP authentication off, and it needs to be enabled. Please see
Enable or disable authenticated client SMTP submission (SMTP AUTH) in Exchange Online
as well as
What are security defaults?