Yes!  The 30 day trial period is completely free, even if you're adding a second or third domain to an existing account.  We don't even require payment information to get started. If you're not impressed by the performance of SpamHero then simply switch your domain away any time during the trial.

Remarkably effective. Because our filtering rulebase is updated multiple times per day by real humans, SpamHero is able to block new spam messages that our competitors often miss. We are so confident that you will be impressed by our service that we offer a 30 day free trial so you can try it without spending a dime.

Because there is nothing to install on your computer or on your mail server, SpamHero will work with virtually all email software and mail servers.

When email is sent to your domain, the sending server checks your domain's MX record. This record tells the world what mail server handles your email. When you subscribe to the SpamHero service, you will change your domain's MX record so that it points to our mail servers instead of your domain's actual mail server. At that point, all your email will be routed to our servers, where your email will then be filtered and just the good mail will be forwarded on to your real mail server.

It depends on who handles your domain's DNS records. In most cases, this will be your web hosting provider. We will provide instructions that you can forward to your web hosting provider so that they can update your DNS records for you. If you're comfortable making the change yourself, many web hosting providers also provide a control panel that you can login to and make the change yourself. If your web hosting provider does not provide DNS services for your domain, they can usually tell you who does and point you in the right direction. If your web host isn't able to help you, let us know, and we'll help you get this done.

By subscribing to the SpamHero service, you will actually be increasing the reliability of your email service in three ways:

• If your mail server were to go down, our mail servers would queue your email (for up to five days) and your mail would be delivered automatically once your server comes back online.
• Each domain we filter email for is assigned to three redundant mail servers that are located in separate data centers. Should the primary filtering server go down, there are two others that will immediately begin to queue your email until the issue with the primary server is resolved.
• We provide a free quarantine viewer for your domain that will store all email that is blocked for at least 30 days. Even though it is extremely rare for our SpamHero to block a real message, you can have peace of mind in knowing that you can always release a message from the quarantine viewer if it gets placed there.

While SpamHero will drastically reduce viruses received by email, we do not recommend disabling your anti-virus software. There are two reasons for this:

• Not all virus threats come by email.
• While our filtering system has been found to be very effective at also blocking viruses, the more layers of protection that you can have on your computer, the better.

The maximum message size per email ranges from 50mb - 400mb, depending on the service plan you select.  See our Pricing & Features page for details.

No.  An MX record points to your inbound mail server and it is quite common for the outbound mail server to be different than the inbound server.  We have never heard of anyone having an issue with their email getting blocked because their inbound (MX) server does not match the outbound server. 

It is a common misconception that deliverability issues can occur if you point your MX record to a server separate from your outbound mail server.  This myth stems from the fact that many email servers do what is called a "reverse lookup".  However, this reverse lookup is against the IP address of your outbound server and has nothing to do with your inbound (MX) mail server.  The purpose of this lookup is to confirm that the IP that you sent your message from points to a hostname that points back to this same IP.  That confirms to them that you are not spoofing the hostname of your outbound server.

Don't worry!  Every customer gets free protection from overage billing spikes.  You are protected against billing spikes that are more than $20 over what your domain averaged for the past 3 billing cycles [ see details ].