HI @luyuanx2
Welcome to the community!
You are adding numbers after @ sign please try to add like an example or any alphabets it will allow you.
I think it's because this email address does not conform to the standards in https://en.wikipedia.org/wiki/Email_address
The domain name part of an email address has to conform to strict guidelines: it must match the requirements for a hostname, a list of dot-separated DNS labels, each label being limited to a length of 63 characters and consisting of:[6]:§2 uppercase and lowercase Latin letters A to Z and a to z; digits 0 to 9, provided that top-level domain names are not all-numeric; hyphen -, provided that it is not the first or last character.
The domain name part of an email address has to conform to strict guidelines: it must match the requirements for a hostname, a list of dot-separated DNS labels, each label being limited to a length of 63 characters and consisting of:[6]:§2
A
Z
a
z
0
9
-
In your case, the domain is all-numeric, which likely is the reason that these addresses are invalidated.
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