A method, system and apparatus for the offline securing of messages through selective security data replication. A method for selectively replicating security data for offline processing of electronic messages can include identifying a messaging partner associated with the electronic message responsive to processing an electronic message. Subsequently, it can be determined whether electronic messages previously had been received from or transmitted to the identified messaging partner. If it is determined that electronic messages previously had been received from or transmitted to the identified messaging partner, identifying information for the identified messaging partner can be added to a batch listing. Consequently, during a replication process, security data can be selectively replicated from an external repository to a local repository only for security data associated with messaging partners corresponding to identifying information in the batch listing.