Can not receive confirmation email

Hi there,

My colleague just registered an account, his email is jason.wu@tes-tec.com
However, he cannot receive the confirmation email from you.

We tried to use other emails with other domains, they work ok.
I want to know if there is any restriction for the domain tes-tec.com ?

My account is hunt.lin@tes-tec.com, I registered a couple of years ago… I worked fine for me.

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hUNt0