@Netbug Hello, I created new Google account for testing. Working fine, but to gmail only. I have different email provider for Omada, unfortunately no sent email to this different provider...

Username and Sender addres do you have the same? "Send Test email to" must be different gmail address.

@Netbug After test I received email from gmail "A less secure application has been blocked" In account is necessary allow this less secure applications.

@Netbug Hello, working this setting: SMTP: aspmx.l.google.com port: 25 (without SSL) authentication: yes sent test email to - must be any gmail.com

@lexam Hello, I had the same problem: https://community.tp-link.com/en/business/forum/topic/265924

@WesleyB Hi, I don't understand why faulty firmware is still offered, why it's not removed. Pavel