On Tue, 2014-06-03 at 18:13 +0200, Chris Knipe wrote: > We have a subscription service where users can sign up and receive > free access, prior to having to subscribe. Allot of users, are > signing up with DEA based email addresses, thus gaining access and > more than a single free trial - which is far from ideal for us.
Presumably you mean they're signing up with "disposable" email addresses... > Is there any specific MTA way of dealing with DAE providers? I can't think of one that's specific to the problem, no. Without any specific machine knowledge of a remote domain, how do we (that's a rhetorical "we") know that the addresses originating in that domain are "disposable"? What's to stop someone simply using address001@gmail, address002@gmail and so on? How would you determine those to be "disposable" (or otherwise), given that they're within a massive email domain which categorically isn't intended to be used like that? Personally I can't think of a DNSBL (don't use RBL, it's a trademark!) that maps 1:1 onto "disposable" email domains. I'm not saying there isn't one, though - and if there was, that's your answer. I'd look at another route - like making the signup process have some other identifier which is less likely to be throwaway, such as a credit card verification or PIN-via-SMS to a specified phone number which you can correlate multiple signups against. It'll cost you a bit more, but it may bring in more revenue (or prevent loss of revenue via the methods you described). Graeme -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
