Yes,

I have an account on Hetzner Dedicated Server Provider on Germany and I know what's happen. This happen because some Robs come to our websites and sart to make Spammer Registrations and several emails sent and some of emails was real and some of them no.... and some abuse me and my IP is blocked now and my client are angree because many real Emails not working and this come from UN-Secure or UN-Inteligent Capcha of DNN.

DNN should be Repair and fix this IMPORTANT PROBLEM by Redesign Intelligent caphcha like Yahoo.... like Google like many other simple and small website...

for example ask some thing: What is sum of 7+5=? [ ] this is very nice captcha or show same Charachters but some one Blue some other color and ask Visitor: Type Only Blue Carachters.... or same this..... This is Intelligent base CAPCHA

IT IS IMPORTANT. DNN should change captcha system in 7.3.1 as soon as possible. it make very big problem for many dnn website and this is CRITICAL NOW....

Armin - you said you were making registration private. Has that stopped the registrations?

If so you need to work on getting the block lifted. That is not a DNN problem.

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Best wishes,
- Richard
Agile Development Consultant, Practitioner, and Trainer
www.dynamisys.co.uk