Listmonk: self-host your newsletter on a VPS
Install Listmonk on Ubuntu 24.04 with Postgres, config.toml, a systemd unit and TLS, then connect SMTP and understand what deliverability really costs.
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Mailcow on a VPS: self-host email Gmail accepts
Test outbound port 25 before installing mailcow: a block means mail never leaves the queue. Then set the DNS that stops Gmail's 550 5.7.25 PTR rejection.