Found a vulnerability in one of the providers, tried to contact them to tell them the information that they missed one important point in the new slot. But they are not even in a hurry to answer me, although the provider is on many major sites.
Of course, I saw a lot, but I have not seen such indifference yet)
Yes, they may not answer you at all.
Many times I faced disgusting support work on different sites. Including with his provider corresponded. In the end, I solved the problem, but the support staff tortured my entire nervous system with their idiotic demands.
If we talk about using email, then you definitely need to have several addresses, not even 2-3, but more. All sorts of things happen in life. But the ability to write letters and send them to the addressee should always be reserved. Otherwise, at the right time, unexpected troubles can happen. And of course, the addresses should be not only on Gmail or Yahoo, but also on alternative ones like mail.com, yandex.com and others