Sending email reminders using theocbase smtp is not possible at the moment.
Our service provider has disabled sending emails as there are too many emails been sent and it is against their terms of sercvice.
We are working for alternative solution for this. We are very sorry if this causes more work for you at the moment. Please prepare for a solution where mass mailing is not an option anymore. Maintaining such system would cause more costs and work and that is why an alternative feature is probably developed.
Thanks for your patience,
-- theocbase team --