turboSMTP will not consider subscriptions made with
free email providers like Gmail, Hotmail, Yahoo! or the likes.
The reason is simple: such free accounts are very often used by spammers to deliver scam messages and don't allow to
configure DKIM and SPF to ensure the highest delivery rate. Since we have to protect the efficacy of our servers (and, consequently provide the best service for our clients) we are going to refuse
all registration proposals coming from free email accounts.
To get accepted by turboSMTP it's thus necessary to have an
account related to an owned and real domain (such as
info@yoursite.com).