Getting error : throttling rate exceeded

We are using ses.getIdentityVerificationAttributes to check is email is verified or not in aws for example var params = {Identities: ['test@test.com']}; ses.getIdentityVerificationAttributes(params, async (err, data) => { if (err) { console.log("IN Err =======>> ", err); } });

here we are getting are error some time. throttling rate exceeded what is the reason of this error ? is there any alternative way to get email verified details.

Thanks