I tried verifying my sender email but I cannot receive verification code

Hello,

I try verify sender email, but I cannot receive verification code. 

I want to set contact@basalt.work as sender email, and I think JotForm cannot to send code to me via smtp.

You can check your Spam folder also and check if the verification email is there. By the way, how are you trying to add your email as a sender email?

Is it through 

Accounts>Settings>Sender Emails>Edit

or through your form

How-to-Add-a-Custom-Sender-Address-to-an-Email-Alert?

You may also try to Whitelisting-JotMails-IP-Addresses and see if that helps.