The Hidden Cost of IP Blacklisting
Learn how spammers damage the reputation of service providers and cause problems for delivering email.
Web and email hosting providers without automated outbound spam control are at risk of incurring excessive costs. Spammers compromise provider services, leading to reduced IP reputation and problems delivering email. In this whitepaper, we analyze and explain these hidden costs.
Spammers constantly seek new ways to deliver to their mailing lists. Recently, spammers have increased their use of compromised accounts, servers, and scripts to send spam. In 2012, this type of compromise increased dramatically, as spammers switched from bot-net spamming to the abuse of more reliable and scalable hosting resources (see Figure 1).
IP reputation services like Spamhaus keep track of abusive IPs. When spam is sent from a web or email hosting machine, that machine attains a negative IP reputation and can no longer reliably deliver email to the Internet. In especially severe cases, a provider’s entire network is blocked.
Figure 1 - Graph showing the dramatic increase in spam originating from hosting providers. The graph summarizes the average number of unique domains originating from each IP tracked by ReturnPath’s services. This trend is indicative of the shift from bot spamming (lots of IPs with a few domains per IP) to compromised account spamming (fewer IPs, but with more domains per IP)
What providers do today
Step 1: Discovering the problem
The MailChannels Difference
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Outgoing email is scanned, spam is identified and blocked. A notification is sent so you can shutdown the user or script responsible for the spam.
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