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How do emails detect and send spam to the junk folder but allow some emails come through to the inbox?

How do emails detect and send spam to the junk folder but allow some emails come through to the inbox

It is quite often that we open our email account and find that several emails have arrived in our inbox whereas the rest have been sent to the spam folder or Junk. Come to think of it, we ask ourselves as to how is it done by the account? The interesting thing is, spam emails are not handled by our email account,  instead it is handled by an email server. Email servers are quick to identify emails that are unnecessary or spam, just by going through the email address.

When it comes to your email server, either accepting or sending emails in the spam folder, is done by following a complex algorithm. Apart from the server going through its lists of ‘bad’ IPs, there are several other factors as well that are considered.

For instance, your email server will detect emails that consist of spam trigger words such as ‘this is not spam,’ ‘click here’ and ‘congratulations’ etc. out of nowhere. Email servers not only go through the IP blacklists but also keep a constant check on the conversation in case if the sender tags a spam email. This is why in some cases when you try to reply or send an email to the same email address, it will show up as ‘failed to deliver.’ The reason being, that the email server might have considered the email spam.

In other cases, you will often see marketers sending out emails to recipients without their permission. Yes! Marketers need special permission before they are allowed to send their promotions and advertisements via email. Unless you have provided them the permission, the email will show up as spam. Furthermore, email servers will also detect fishy or misleading subject lines. Therefore, if you have an email with a subject such as ‘Urgent-Update your information’ or ‘Thanks for your order,’ there are good chances that the email will be thrown in the spam folder.

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