Stop outbound spam, avoid blacklists

MailChannels software implements best practices for
email delivery, automatically.

Transparent Antispam

Remove spam without impacting users

Smart Outbound Relay

Avoid blacklists, with a smart outbound relay

Inbound Antispam

Carrier-scale filtering, with a great user interface
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OUTBOUND SPAM FILTERING

Outbound spam filtering is about preventing spam from leaving your network where it can wreak havoc on your sender reputation and cause email delivery issues. A well designed outbound spam filtering solution automates blacklist remediation that would otherwise be handled manually by support staff.

ISPs and hosting companies - organizations whose networks host many thousands or millions of users - need to pay attention to their outbound email reputation, or email deliverability will be severely degraded. As the number of blacklisted IP addresses in a network increases, the ability for users to have their email reliably delivered decreases. Once an IP has been blacklisted, remediation (i.e. having the address removed from the blacklist) can be a slow and complex process.

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A DNSBL (DNS-based blackhole list, block list, or RBL) is a compilation of Internet Protocol (IP) addresses that have been identified as a source of spam. DNSBL lists such as Spamhaus SBL, Spamhaus XBL, CBL, and SORBS monitor the email sending reputation of your network, adding IP addresses when they send spam to a spam trap address and other spam sensing mechanisms.

Successful outbound spam filtering requires a three-layered approach encompassing:

  1. Accurate spam content filtering, preferably utilizing a number of different spam filtering techniques such as signature or fingerprint analysis, heuristic analysis, and URL reputation;
  2. Customer identity-based policy management (using RADIUS and other AAA protocols), allowing for precise control over the quantity of abuse permitted from different segments of the network; and,
  3. IP address re-mapping, allowing suspicious customers to have their email traffic relocated onto a different subnet to protect the reputation of the primary IP address space.