Am 22.11.2013 10:12, schrieb Alexander Farber:
> I run a Drupal 7 website on a CentOS 6.4 server with 
> postfix-2.6.6-2.2.el6_1.x86_64.
> 
> In the last few months the amount of fake users trying to register at my 
> website has increased dramatically - I get
> 2 or 3 of such registrations per minute.
> 
> Mostly they have fake mail adresses with many dots and at gmail.com 
> <http://gmail.com>:
> 
>     c.ar.eer.t...@gmail.com 
>     all.ego.ry.nl....@gmail.com 
>     b.is.on.bk....@gmail.com 
> 
> At the end those users can't register, because a mail confirmation is 
> required.
> 
> But my mailbox is filled with mail bounces and in the /var/log/maillog I see 
> my site contacting Gmail servers again
> and again

this should be solved on the website and not the MTA

* captcha
* hidden honeypot field
* session token
* don't accpet the e-mail address at all

problems needs to be solved on the root cause not worked around somewhere else

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