A spam filter is a method of processing emails and segregating those emails into categories. Depending on the types it decides whether to proceed with a further procedure to inboxing, discarding or moving the email to the spam folder. A spam filter concept is similar to a process of dividing a substantial amount of data into chunks and then removing unwanted vague data.
Mail filters organize the incoming mails or remove Spam or unwanted emails that have been injected or send from the current email server. These filters are implemented almost at every organization to keep their people and data safe from unwanted emails.
In this tutorials, you will learn A-Z of email spam filters and steps to avoid your emails hitting the spam filters.
Knowing what spam email is, is not enough but how these spam emails are different from the other emails is something you should learn. Detecting spam emails and moving to them to spam folders seems to be magic, but the real challenge and topic of interest are how to inbox more and avoid Spam.
A spam filter detects the nature of emails by parsing the content of the email body which can have unwanted, malicious or unsolicited data and accordingly move to the spam folder and prevents inboxing.
Spam filters are used by every ISP (Internet service provider) to keep their customers away from Spam. Spam filtering is implemented on both side, i.e. On incoming emails, also known as inbound emails and the emails going outside the network, also known as outbound emails.
Right from small to large-sized companies, everyone has their spam filters to avoid Spam and malware within the network.
Spam filters use decision-making algorithms which parses every email and assigns a number. This number is calculated based on the set of rules which these algorithms use to parse email. The number is the probability of email as spam-related content. Once this number crosses the threshold, these emails are automatically marked as Spam. The number is also known as a spam score for an email.
Spam score depends on various parameters not just the content of the email, like the email server used to send emails, IP and domain reputation.
As you have seen above, a few techniques for spam filtering, which is based on content, IP, header and some custom rules. Let us see a few more spam filtering methods which are as follows:
Spam filters are necessary because spamming has become one of the business models for spammers; they earn almost $8-$10K per week. Due to which spam filters is a must for your business. It is said that out of 100 emails, around 60-70 of emails are Spam i.e. (70% of emails are spam)
These Spam businesses keep on growing every year because it is has become one of a lucrative business. Spammers are getting more creative with their strategies and techniques to inbox their emails. In order to avoid this spam technique, you must keep updating your spam filters.
The spam filters are very crucial though they don't provide 100% foolproof results but are essential to keep spam away from your business. It is necessary to keep your network free from spams like phishing attacks, malware attachments, malicious web links and viruses. Spam filters help in protecting your email servers a getting overloaded but also keeps spam email away from your users and network.
Spam filters can be easily cracked if you follow authentic email practices which are as follows:
Opt-ins are probably the best method to stop a spammer from spamming your database. This method usually allows you to get permission from your recipients. Even Pepipost's Signup forms are by default using a double opt-in process.
This method considers your emails are not spam oriented and must follow all the rules in the CAN-SPAM Act.
Don't consider that you have already got permission from your customers or you can send emails to those who know you like your colleagues, friends or people. It is always good practice to get permission from those you are sending emails sharing a form or subscription(opt-in) links.
The customers already know you because you have taken the permission before. So don't make your email heavy by adding visual effects and large brand images because these are the common mistakes that cost a lot for your campaign either they are rejected or moved to the spam folder.
Always keep your unsubscribe link visible within your email don't hide it. If the link is visible to the people who no longer want to receive an email, they will opt-out willingly instead reporting your email as Spam.
Don't try to build your contact list by adding a purchased email list. These lists are scrapped email id which is invalid and does not guarantee any kind of success for your campaign. This also violates the first rule of getting permission from your recipient.
Sending emails to a purchased list leads to high bounce rates and blacklisting of your emails.
Spam filters are just like a firewall for emails which has various set of rules and learning those techniques will help you build your internal email best practice guidelines.
I hope this tutorial was useful in sharing information about spam filters, techniques and ways to avoid them. Feel free to share your experience below in comments.