has been around since 2004. With hundreds of users sending various email broadcasts to millions of recipients, we’re bound to get abuse reports every now and then. We do take abuse reports seriously, and we go to great lengths to prevent abuse within our system.

How prevents and combats abuse

  • We have a team of human reviewers, who approve new accounts and detect abuse within our system. Our staff uses a variety of criteria to evaluate accounts, ranging from the obvious WHOIS and IP information, to some not–so–obvious behavioral patterns.

  • We require all users to agree to our Terms of Use before setting up a account, and again before importing any existing customer lists into their accounts.

  • We offer customizable signup forms for customers who are starting from scratch with and don't have a list of customers to import. These signup forms only use the double or single opt–in method, which keeps prank signups out and stores opt–in proof for every subscriber (like IP address and date/time stamps).

  • We automatically insert a one–click unsubscribe link in every campaign sent from our system.

How we educate customers

  • We keep our users updated on the latest best practices, tips, and email etiquette with our blog and customer newsletters.

  • Our guides help users learn their way around and email marketing in general.

  • Throughout’s user interface (when sending campaigns, setting up lists, and designing templates), we provide customers with links and background information to help them understand email etiquette and spam laws.

How we deal with issues

  • We embed every email campaign sent from our servers with a Campaign ID, so recipients can easily report abuse to When we receive complaints through our abuse form, we investigate immediately. If the campaign or user account appears suspicious in any way, we’ll suspend the account during the investigation.

  • We’re registered with major ISPs and anti-spam authorities to receive automated feedback loop alerts when any of our users’ recipients report abuse. When we’re able to parse those alerts, we remove the recipient from the user’s list. If the reports exceed a certain threshold, we send a warning to the user. If the warnings exceed a reasonable threshold, we suspend the user’s account and investigate. Most ESPs and ISPs say a reasonable threshold for abuse complaints is 0.1 percent, which means 1 out of every 1,000 people reported your campaign as junk. Because of the sheer volume of emails sent from our IPs, and because most of our IPs are shared across multiple users, our threshold is stricter than that.