Do you have a problem registering or ordering?
For example, do you not receive an e-mail if you want to register in the shop?
Do you also not receive an email with an order confirmation or if you have written to me?
If so, this may be due to censorship, e.g. by google.
This company has taken measures to “prevent and protect against SPAM” so that certain mails no longer arrive in your e-mail account.
This means that it is no longer possible for you to do what you want and with whomever you want.
In this case, I would urgently change the mail provider if he prevents what I want.
Even in expert circles and with many providers, there are apparently problems with the data octopus.