Can Suppression Lists be Used in a GDPR-Compliant Manner in Email Marketing?

It is standard practice for Email Service Providers (ESPs) to maintain client-specific or even global suppression lists (do-not-contact lists), in order to prevent the importation into the system of email addresses for which contact must under no circumstances be re- established. This may be because the recipient has complained in the past and has made the desire not to receive further emails from this sender explicit.