We advise adding an SPF file in order to avoid having messages flagged as spam. If you are sending from a static IP address, include it towards your SPF report in the domain registrar's DNS configurations as follows: Add a personalized certificate prior to migrating and afterwards delete the certificate https://cloudflarednsserver12221.mybuzzblog.com/5623304/the-single-best-strategy-to-use-for-directadmin-migration