Redundancy involves having multiple systems or components in place so that if one fails, others can take over. In email marketing, this can include:
Multiple Email Servers: Use multiple email servers to ensure that if one server fails, others can handle the load. Redundant DNS: Employ redundant DNS providers to ensure your domain remains reachable even if one provider goes down. Failover Systems: Implement failover systems that automatically switch to backup servers in case of a failure.