The second step to maintain and back up your email server is to configure it properly according to your needs and preferences. You should follow the best practices and guidelines for your email platform, such as setting up the correct domain name, MX records, SPF records, and DKIM signatures. You should also optimize your email server settings for performance, security, and deliverability, such as adjusting the bandwidth, memory, and CPU usage, enabling SSL/TLS encryption, and avoiding blacklists and spam traps.
https://www.linkedin.com/advice/1/what-best-practices-email-server-hosting-maintenance-backup
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