Email send failure
I'm using Mango 3.7. Recently I noticed I don't get any email alerts from Mango anymore. Event handlers are set up to send emails and they worked for years and years.
I went to email settings and confirmed the SMTP settings are still correct. I also tested the settings in a different tool and they definitely work.
When I hit the button to SEND TEST EMAIL, I get no email but an error message in Mango: Error sending email to 'email@example.com' — Email send failure
What can be wrong?
Turns out that the SEND TEST EMAIL doesn't send a test email using the values that you just entered but using the values that are saved. So you cannot test before saving.