Just joined and can't seem to test anything

Hi, I read where the free trial only allows sending emails to other mailbox.org addresses.

I don't know anyone with a mailbox.org account.

What's the point of a free trial if I can't test send/receive?

What's the point of a free trial if I can't link POP3/SMTP to my desktop email client for testing.

I also created an alias and given I can only send to an mailbox.org account, I tried sending from the recovery email account and I am still waiting (30-mins) for it to arrive.

I then decided to pay for a month, but given the comment when setting up this account it said I could use any name, I did. Now when I want to pay it wants to use the first/last I created the account with. Will the credit card process?

Do they bill in $USD? My bank has a surcharge for currency conversion and 3E will cost me $USD13.xx.

All seems a bit weird. I really would like to move to mailbox.org but this ain't easy.