For global form validation rules, at the moment we can only do one of two things:
(1) Either use the default file provided by Marketo which have 3000+ domains
(2) Or create a separate rule blocking specific domains
The issue with (2) is that Marketo has a 2000 character limit for the list of domains that hardly suffice requirements especially when we see increased bot traffic. At the moment the default file cannot be edited as well.
It would be great if Marketo provides a file based approach for the domain list so we can make use of all the free domains from the default file as well as others that we might want to add. This either/or approach is limiting in nature.
Best,
Shweta.
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