SMTP connect() failed on Appwrite Messaging

Hi,

I've upgraded to Appwrite 1.5.2, and want to try out Appwrite Messaging with my SMTP server. I've tried Gmail SMTP relay and Mailersend.com, but both give me SMTP connect() failed. Which is kinda weird, because if I use the same credentials in the project settings in the SMTP tab, Appwrite sends out confirmation and sign-up emails just fine.

How can I debug this?

Kind regards,

Bas

Is SMTP set up in the server .env, or just in the Project settings?

in three locations, the environment variables (which work, Appwrite is sending out emails to admins), the project SMTP tab (which works, Appwrite is sending out emails to site user signups and such), and in Appwrite Messaging, which doesn't work with the error SMTP connect() failed. All settings are the same server, same credentials and same TLS settings. I've tried both Gmail and Mailersend, all works except Appwrite Messaging.

Any chance you can test without tls?