Whitelisting IP addresses in the SMTP settings allows the use of wildcards. I need to whitelist all the IP addresses that Google Apps can use for email. This amounts to over 223 000 addresses and is virtually impossible to cover using only wildcard entries.
If CIDR format was available to specify the IP ranges to whitelist, then only 12 entries would be required to cover all the IPv4 addresses currently in use by Google Apps (and only 6 more if IPv6 was required).
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