[_eht]

The biggest issue you will likely encounter is having clean IP addresses to send from. If you have that problem solved, the next hurdle will be realizing that Stalwart is more than you would need to manage sending daily emails. If you have the IP addresses, you could just use a script that grabs email addresses to send to for the day, and ship them with a fairly straightforward SMTP daemon (sendmail) installation on a VPS.

Stalwart might be a good use case for your business/employee mail account handling, however.

[tetrisgm]

Yeah looks like based on the replies it's more of a Gmail alternative. Which is great but not about sending so much. Have you had a chance to setup sendmail? how we've been using our own baremetal setup on hetzner (ipfs box) and could use that for sending too. Any recos on how to make sure the IP is seen as clean?