Having a single MX record that directs email to one mail system removes many potential problems. You can have multiple MX records however, that can cause problems for mail delivery.
The important thing to remember is that you can only have a single SPF record for your domain. We've updated our SPF records guidance at the end of this article. Often the SPF and MX records are the hardest to figure out. Go back to Network planning and performance tuning for Office 365. You will need to select which records apply to your organization and fill in the appropriate values. Sticking around to use the reference list for your own custom deployment? The below list should be used as a reference for your custom Office 365 deployment.
Need step-by-step help to add these records at your domain's DNS host, such as GoDaddy or eNom? Find links to step-by-step instructions for many popular DNS hosts. Want to see a customized list of DNS records for your Office 365 organization? You can find the info you need to create Office 365 DNS records for your domain in Office 365.
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