All email is stored on a GCP instance, which runs Postfix and Dovecot.
This host receives all email for both chriscowley.me.uk and cowley.tech, but does not forward/send them.
Why not send through this host?
First, GCP block outgoing SMTP connections on several ports. Second, email forwarding is based on reputation and I can't be bothered to deal with it.
For a long time I used Mailjet for sending emails, but then switch to SMTP2Go because it allows more key/secret pairs. These need to be configured on the clients (Thunderbird, Evolution, phone, whatever).
TLS Certificates
Managed using LetsEncrypt using a really simple script:
/root/renew_certs.sh
It runs daily to renew all certs on that host
Backup
Backups use Restic and are stored in Backblaze B2. The bucket is called instance2-backup.
There are 2 scripts for the backups:
/usr/local/bin/clean-backup
/usr/local/bin/run-backup
The backup is run every day and the clean up runs once a week.