Thank you!! After trails I realized Gmail works best vs other mails. Just to keep my main account isolated, I’m getting everyone to send a new gmail account
Gmail is definitively not the best provider you can get, it has a message limit and google is not great what privacy is concerned (after all their business is selling personalized advertisement space).
But I’m glad it works good for you.
In our provider db you can find out which providers are known to work or to be broken:
https://providers.delta.chat/
Which mail providers did you try?