@inproceedings{stringhini12:usenix,
    author = {Gianluca Stringhini and Manuel Egele and Apostolis Zarras and Thorsten Holz and Christopher Kruegel and Giovanni Vigna},
    title = {{B@bel: Leveraging Email Delivery for Spam Mitigation}},
    booktitle = {Proceedings of the USENIX Security Symposium},
    address = {Bellevue, WA},
    month = {August},
    year = 2012
}