> We wish to open only one IP in the firewall.

Can you explain why it matters to you how many different IPs are used
to provide the service?  Do you use IPv4 and IPv6 addresses?  Have you
also asked Google if they will only send mail to you from a single IP?

https://www.razlee.com/

In squid it's possible to whitelist addresses by dns names. 

Eero 

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