MY mail servers only accepts mails if the client is not trying to use TLS.
Testing with "sendEmail" from the comannd line only works if the parameter -o TLS=no is issued.
I there a way (Environmental Value) to set the SMTP to "no TLS".
I've had this problem since the update to meteor 1.4
I discovered that Meteor will try to use TLS if it’s enabled in the server. The docker image for versatile-postfix has TLS enabled and confugures a self-signed certificate. Disabling TLS in the server is the workaround I found to work.