Syntax of DNS TXT record for SPF

The DNS TXT record for SPF for my domain has the following content:

v=spf1 mx include:wildapricot.org ~all include:zoho.com ~all

What does the “mx” indicate, or is it a syntax error?

MX (Mail eXchange) just means your inbound mail server’s IP address. Some mail hosts use the same server for inbound and outbound mail. You only need the ~all at the end.

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