A week or so ago, I discovered that MXToolbox was reporting an error when performing an SPF Lookup on my primary email domain abzorb.co.uk.
https://mxtoolbox.com/SuperTool.aspx?action=mx%3aabzorb.co.uk&run=toolpage#
"SPF MX Resource Records - Too Many MX Resource Records(24)"
I have since consolidated all my "include:" references to "ip4:" references but I'm still being flagged as having too many MX resource records.
We use Mimecast and so the domain's two MX records are Mimecast's EU servers.
My current SPF is: v=spf1 a mx ip4:217.16.193.20 ip4:217.16.192.74 ip4:88.215.56.232 ip4:154.51.129.140 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:148.105.8.0/21 ip4:91.220.42.0/24 ip4:146.101.78.0/24 ip4:185.58.85.0/24 ip4:185.58.86.0/24 ip4:195.130.217.0/24 ip4:207.82.80.0/24 ip4:213.167.75.0/25 ip4:213.167.81.0/25 ~all
What am I missing? Why am I still being flagged as having too many MX resource records?