I have neutralized some bots but a few domain names they use as an email address are as follows:
coin-collective.com
nowmailinfos.info
starterplansmo.info
moderntransfers.info
mymailindex.com
MyMailIndex is the biggest offender, with the most records on stopforumspam.com.
Bots are coming from Japan, Columbia, USA and India mainly.
http://www.stopforumspam.com/search.php?q=mymailindex.com