3CX welcome email not working for some users

[Malik.Abraham]

Hello,

We are using 3CX hosted in AWS. some extensions suddenly can't receive the welcome email either using 3CX SMTP or custom SMTP on O365.
the email address itself not blocked as I've created a new extension and the welcome email was sent successfully.

I even tried to remove the email address and change it to a different email for the impacted extension and it didn't work.

How can we view the welcome email queue from the 3CX server itself?

any thoughts?

 

[SteveITS]

I’m not sure you can, I think it connects directly out.

Are you using a connector in 365?

Could it be getting caught by M365? I’ve had it silently quarantine valid emails. https://security.microsoft.com/quarantine