Email marketers know that the effectiveness of their campaigns depends on how many emails actually reach their subscribers’ inboxes. Whether the goal of a campaign is to encourage recipients to download an ebook, book an appointment, or make a purchase, the message won’t be seen if it ends up in a spam folder. To avoid that, marketers often use an email deliverability checker to ensure their messages are not being mistaken for spam.

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An email deliverability checker is a tool that analyzes your outgoing emails and calculates how likely they are to end up in the junk folder. It usually takes into account several factors, such as your email server IP address and its reputation in the eyes of major ISPs, the overall assessment of your email content by SpamAssassin, the status of your SPF & DKIM authentication protocols, and information about your possible presence on spam blacklists.

Using an email deliverability checker is important for any marketer who wants to improve their email marketing campaigns. However, it’s also important to note that these tools aren’t able to guarantee that your emails will always land in the inbox, even with the best practices.

There are a number of great email deliverability checker services out there. GlockApps, for example, is a tried-and-true service known for its detailed reports that cover virtually all the checks marketers need to perform. It includes an email deliverability tester, spam filter test, spoofing detection, and HTML error checker, among others. The service offers free deliverability testing for three tests and then charges a monthly or annual fee depending on the number of monitors and spam blacklists you want to track.