Spammers have moved away from using botnets – networks of infected PCs – to abusing email-sending services.
These service providers have thousands of well-maintained, reputable IP addresses that ensure reliable email delivery for their customers. Legitimate marketers use them to send email campaigns to customers who have “opted in” to receive such communications.
However, this infrastructure also attracts spammers because it provides an enormous capacity for their scams. Spammers use phishing campaigns with worrying frequency and email-sending services are their preferred way to send these nefarious campaigns due to high deliverability rates.
This whitepaper looks at how email-sending service providers can protect their networks from spammers who abuse their self-signup portals to get bogus accounts.