For some reason, the email validation is rejecting valid and known emails under our company’s domain.
I was wondering if there was any way to turn off email validation during form submission, with the assumption that we’re okay with assuming the risks of spam and other undesired email submissions.
Just to add to this, it is well-known that it is almost impossible to create an email validation that will work 100% of the time without false negatives. The spec is very forgiving on what constitutes a valid email string. Hubspot simply shouldn't bother trying to do this. See this: https://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx/
It’s not currently possible to turn of the default email validation. Are you finding these emails are getting rejected when manually creating contacts, when contacts are submitting forms, or when creating contacts via the API?