I am using Live Domains (domains.live.com) to host two emails from my website. And I'm using these emails to send automated "Thank you" emails to users who Register in my website.

The website is www.saladoprofessor.com.br

Unfortunetly, without any warning or any error, Outlook.com stops sending emails. Without any reason as I can see. And, after a lot of time, start sending again, but only to new registered users, not those who did not receive when it stoped.

Does anyone have a clue of what is happening here? Is there any kind of limit of emails to be sent with SMTP conections in live.domains.com?

Thank you!