Webmail move: Checklist

• Stop old and new postfix/dovecot/nginx processes
• Start copy of mail folders to temp dir
• Copy TLS certs to new machine
• Check new postfix/dovecot conf is pointing at the right cert
• Confirm that new postfix has the right domains
• Create sites in new nginx for new domains
• Update webmail app config for new domain names
• Login to Bytemark panel
• Login to Mythic account
• Get the "yes it's really my domain code" from Mythic and apply it to the Bytemark panel (for all domains that Bytemark is still hosting)
• Delete other records from Bytemark dns
• Add domains to Mythic
• Create records for mythic
• Wait for mail messages to finish transferring
• Move into place
• Start new dovecot, maybe wait for indexing (Todo: check if there's a "reindex" command)
• Start nginx, confirm dns and imap
• Check imap from phone
• Start new postfix

If there are problems then can point dns back at old machines.

Todo: Setup a couple of scripts to add/remove the DNS records from the mythic api