I was able to reproduce the error and now I can reproduce this with my account as well. After some testing, it seems that non-existing email domains get invalid error and this doesn't happen if the domain is a legitimate one. For example, I used this site to see if a domain exists. If you search "hotel.com.ve", you will see it's "researved" meaning it's used by someone. Therefore I used this example to test and this domain didn't give me an error.
Do you have any example domain with .com.ve which actually exists but gets "invalid error"? If so we can do some more testing.
I tested this with my form and I think "test" in the domain is causing the error. I tried with "hola@aero.com.ve" and "hola@officina.com.ve" and didn't get invalid error. Could you try that?