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What Triggers Spam On Emails?

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01 Jan 2021


Internet Service Providers more so email providers popularly known as webmail have devised mechanisms that have the power of searching for unwanted email messages. With the spam-blocking tool, all incoming emails are filtered and any unwanted messages are flagged as spam. The only challenge is that the spam-blocking tool can block legitimate emails something that’s raising questions about the credibility of this tool. Spamming will cripple all your efforts of delivering the best email campaigns since your message will remain unopened forever if it makes its way into the spam folder. In fact, of all the tools that guide email deliverability, none of them match the ability of the spam-blocking tool.

If you fail to follow spam guidelines, your ability to record more opens as well as clicks will be jeopardized. On the positive side, there are spam checking tools that can allow users to find answers about the blockage of their emails. If you're worried that your emails are being marked as spam, you can run a spam check to narrow down why your email is being blocked. Even though we have different spam filter tools that work in separate ways, there are measures that you can employ to reduce the chances of your email being flagged as spam. The first thing that you’ll be required to do whenever you want to prevent spam filters, it’s important to understand what causes spam.

What triggers spam on email?

There is a lot that can make your email message to be flagged off. In this article, we’re going to look at some factors that could trigger spam on your emails.

Words and Phrases

In many cases your email will be marked as spam anytime you choose words that are commonly known as spam triggering words. The majority of these words can appear on both your subject line as well as the body of an email. Spam triggering words could be the reason your email has been sent to the spam folder. Many of these words can be single words, phrases, or even characters that will cause your message to be filtered as spam. However, one incident of these words will not cause your email to be flagged off. Persistent application of spam words in your campaigns will see your emails filtered as spam. Single words that are considered to be spam include free, guarantee, a million, Viagra, Xanax, sex, miracle, click opportunity, earn, winner, free together with others.

Similarly, you need to avoid an excess of some phrases, including being amazed, your income, subject to credit approval, earn XXX every month, check for our money order, print out and fax, call now, act now, free trial, meet singles and others. If you’re fondly writing your email in all caps just know that you’re increasing chances for your message to be labeled as spam. Over relying on punctuation marks specifically too much use will land you on a spam list. Too much usage of links that have long URLs that are accompanied by the word ‘click here’ will jeopardize your effort to generate more leads. Not to mention the excessive use of $$, %, and other symbols. In all these cases, you’re most likely going to have your message marked as spam.


A point often overlooked is that emails that depend entirely on images have higher chances of attracting spam filter. This can be prevented when you adopt a hybrid system where several lines of text are accompanied by images. While using images, it’s important to avoid pictures that carry explicit content since there are powerful filters that can detect the content of your image.


Traditionally, spammers mastered the art of coming up with a link for one thing when in a real sense the link is something else. And this is what spam filters are often waiting for. The only challenge is that it can mark legit links as spam.

Email Engagement as well as Sender’s Reputation

Interestingly, content is not the only thing that could make your email to be filtered as spam. A source familiar with the working of spam-blocking tools has indicated spam algorithms can compare the general behavior of the sender in terms of opens rates, conversation rates plus the number of times a sender clicks on the email message. Your email will be at risk of being filtered as spam if you have poor engagement records. Ideally, the level of your engagements will not matter if you keep on attracting spam complaints from your subscribers.

Sending Address

A lot of email subscribers may not know this but sending your email from a free email address can attract spam filtering. This is common to email users that have subscribed to Gmail, Yahoo, AOL together with others. The good thing is that this is something that’s not common although you can still prevent it by sending a message from your domain. In a like manner, it will do you no harm if you authenticate your email account. This will allow the ISPs to identify your email as legitimate and this is vital in building your reputations.

Duplicate Emails

Sending a similar email message to the same email data list repeatedly can result in spam triggers. To prevent this, you need to stop the habit of copying a sent email and forwarding it to the same email contacts repeatedly. If you must forward the same message, then ensure that your subject line is moderated.


Although the overall plan of spam-blocking is timely as well as vital, there are cases where legit emails are labeled as spam destroying the general purpose of email marketing. The good news, however, is that various spamming best practices can help users to prevent spam filtering. You can do this better by avoiding factors that could trigger spam, including certain words and phrases, images, links, duplication of emails, and others.

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