Domain and main server are two different servers

All my domain websites are hosted on a dedicated server in Holland, and all the email accounts are hosted on a dedicated server with CWP7 in Denmark.
Does that mean that I can not use letsencrypt on the email accounts?  The domains A records are pointing to Holland and only mail.domain.com point to the mail server along with the MX

Domain xxxx.com A 85.xx.xx.0
Mail.xxxx.com   A  67.xx.xx.0

Thanks

You could manually copy the key/cert over to the other server.
With a script you could check for file changes, then copy it over on a regular basis, using a cron job.