Sending mail using external API

[baek-sang]

Sending mail using external APIs (using services like Mailgun, Sendgrid..)

Receive: addy, cloudflare(@service.com) -> stalwart-selfhost(@stal.com)
Send: stalwart -> ex api(@service.com) -> other

By hiding the actual mail server, you can have more privacy and I think it's good for security.

We would appreciate it if you would consider this feature.

[mdecimus]

AFAIK both Mailgun and Sendgrid support message submissions via SMTP. Stalwart does not supports and will not support third party APIs for message submission, you need to use the SMTP service of your provider and configure it as a relay host in Stalwart.