[throwawaymobule]

can you explain what you mean by that tip? was this spammer using your verification emails to send spam or something?

or was it more complicated, like not needing to store which fake account had which details?

[newaccount74]

The registration form had a name and an email, and I sent a message similar to the following:

Hi <name>, thank you for signing up...

The spammers put their spam message in the name field, so my server started sending messages like this:

Hi Get free cialis now http://example.com, thank you for signing up...