Visa4Uk in the UK cannot receive verification mail.

There may be time delays, and the visa system often twitches. For example, if you don't receive the mail, you will have to wait for ten minutes. If you wait a long time, I will try to receive it the next day. If you haven't received it after waiting for a day, I suggest you re-register an account with another email address and remember the password, and there will be no problem.