Hello developers,
I noticed that the email tester does not dig for IP addresses related to include:spf.domain.tld directive in the SPF,
so it keeps on suggesting to add one or another IP, which are already associated to that spf domain (especially in cases where the number of IPs of the mail server are a few tens).

Spam check feature is using external service, so if you have some suggestions regarding it, the best way to address them is to contact directly the service support using their contact form
https://www.mail-tester.com/contact

Thank you for understanding!

No problem, it was not a critique, but an observation, to ignore that.
It made me spend a lot of time adding a lot of IP addresses in SPF, while they were already associated to the spf.domain.tld in include: (SPF record).
However, a bit of warning about that would not hurt - on the contrary.
I wrote to them too.
Keep up the good work! 👍