Manual failover should be considered in the following scenarios:
- Server Downtime: When the primary email server goes down due to technical issues. - High Latency: When the primary server is experiencing high latency, causing delays in email delivery. - Security Breaches: If the primary server is compromised, switching to a backup server can help mitigate risks. - Maintenance: During scheduled maintenance of the primary server, manual failover can ensure uninterrupted email delivery.