im doing a my bb forum with 5000 members . yesterday i send a mass mail using admin pc now the host has disabled sending emails . how to reactivate it ?
Your host has flood protection on to stop you sending spam. You need to pick up the phone and call them and explain the emails were to your users. If you don't get anywhere then you'll need to send via Mandrill or some other 3rd party service.
You can use 3rd party SMTP service. You can checkout Mandrill and they have 12000 monthly limit on free plan.