To prevent outgoing emails from failing SPF checks and being quarantined, you must add include:spfa.cpmails.com to your SPF record.

Note - The above statement includes several IP addresses and networks, some outside your Infinity Portal's data region. This is done for uniformity and consistency in all Check Point SPF records regardless of your data region. Harmony Email & Collaboration sends the emails only from one of the IP addresses in your region.