Is Not Spam
Is Not Spam - Online Spam checker for newsletters and email marketing
Sending newsletters and email marketing is not easy. You need to work on the design, the graphics and the content. Being busy with all that work, you might forget to check if your content is set to trigger some spam filter which will send your hard work straight to the subscribers' spam folder. IsNotSpam online spam checker was created to help you test email and newsletter content, and alert if it is likely to trigger spam filters.
IsNotSpam has been online since 2009. In February 2025, EXPERTE.com acquired isnotspam.com and integrated it in the EXPERTE.com spam checker. You can still use the tool free of charge and without signup. In addition, the tool now also checks if your email lands in the Gmail spam folder.
How
Simply compose your email and send it to the email address listed at the top of the page, using your usual mail server. You will be able to view an online report detailing potential problems (if any) with your email. Our software automatically checks the main elements which cause emails to be rejected by recipient mail servers. The following tests will be performed:
SPF Check
Sender-ID Check
DomainKeys Check
DKIM Check
SpamAssassin Check
You'll be able to view the results of these tests online within a few seconds, by clicking the View results button above.
More
99.99% of email accounts use spam filters these days. Spam filters recognize spam messages by analyzing message content for spam characteristics. Sometimes these filters fail and mark legitimate emails as spam. Such emails are sent to the Spam folders and are not seen by the recipient. This filter failure is called a "false positive" as it marked a legitimate non-spam message as spam. Newsletter senders and email marketers need to check that their emails do not have spam characteristics in order to lower the risk of their newsletters being marked as spam. By testing your message with "Is Not Spam" you will get a report if and why your message might trigger a spam filter.
Fixing your message is simple:
Change your wording so it does not include known spam phrases, or cleanup your HTML code.
Fix your SPF record, Sender-ID record, DomainKeys record, or DKIM record.
FAQ
We do not share your email address or any other information with anyone, and we will not send you any spam.
We monitor the usage of this service, to ensure that any abuse is minimised. This tool was created for people and companies that send newsletters and want to know if their newsletter would get filtered.
Spam filters check many aspects of emails received. You should check the IP address from which the email is sent to see if it is black-listed. There are many sites that can check if your IP is black-listed.
If these words must be included in your email then leave them. Spam blocking systems score emails received and decide which email is spam based on its score. Strict spam blocking systems will block your email and less strict systems might let your email pass if it does not trigger too many filters.
