Anything that has a "failed" score will indicate that the email was not received in the inbox, which means the email could have been blocked or sent to the junk folder for that particular email client. Webmail/ISP clientsĮmails that have successfully been received in the email will show as a "passed" score. A lower score (lower than 6.0) is considered a passing score with the High sensitivity rating. Outlook rates an email with a 6.0 or higher (out of 10) as a failure. The Microsoft Outlook filter scores from 0-10 on the High sensitivity rating, with 0 being the highest (passing) and 10 being the lowest (failing). This has various sensitivity settings, here we have set it to 'High'. This filter on Litmus uses built-in junk email filter for Outlook, which ships as part of Microsoft Office. Whenever the content in your campaign triggers one of these rules, we'll provide you with feedback on what can be changed to make your email look less "spammy" to Outlook. Instead, we've added in hundreds of spam rules that have been published by Outlook. While this is great for individual users, it's not consistent nor reliable for use across thousands of tests on our servers. Outlook utilizes a self-learning filter to determine what you think is spam. The lower your score, the more likely your email is going to be received in your subscribers' inboxes. Generally, your email should have a score of 5.0 or lower to be considered passing. The higher the positive score is for your email, the higher the probability that the message is spam. The scores can be positive or negative, with positive values indicating spam/failing emails and negative values indicating passing emails. SpamAssassin comes with a large set of rules which are applied to determine whether an email is spam or not. Here we are testing against version 3.3, using its default settings. SpamAssassin is a very popular open source spam filter.
In both cases, a score of 3 or more is to be avoided, but Litmus will always report if the email was considered spam by MessageLabs as a separate calculation to the score. Sometimes, MessageLabs will process the email using its own filter, which reports a very similar score to SpamAssassin but rounded to the nearest whole number. So even with a score a 4, the email may be marked as spam. On most emails, MessageLabs will actually report the score from a very well configured SpamAssassin installation, but there is no threshold in this case. Somewhat confusingly, MessageLabs score in two different ways. It is in use by many large organizations and is very regularly updated. MessageLabs is an expensive corporate server-side spam filter. In these cases, Litmus will report the email as considered spam and mark it with a score of 10.0 (the maximum). Please note, for some very spam-like emails, Barracuda will quarantine the email. You should be aiming for a score below 3.5. How does each spam filter score emails? Barracudaīarracuda Spam Firewall is an expensive hardware spam filter that is installed by large organizations within their own datacentres.īarracuda reports a single score, between 0 and 10 and a flag indicating if the email is considered to be spam.
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