Gmail’s brilliant spam filter has always been a prime jewel in its throne, and has garnered a lot of praise since it came into being (though lately it has drawn some flak for its inability to be as accurate in marking spam mails as spam, as it used to be).
While Gmails’ spam filter is still regarded as the best among web based email services, it isn’t infallible. A lot of times users are curious as to why Gmail marked a particular email as spam. Keeping that in mind Gmail has introduced a new feature that gives more details about a spam mail and why Gmail considered it as spam in the first place.
For example, in the screenshot below you can see that Gmail is being specific and mentioning that the email might contain a virus or a malicious link.
Sometimes, a message from a specific user who has emailed you earlier might end up in spam. It is usually if you’ve previously marked a message by that user as spam.
Gmail also tells you if it has marked a message as spam because it’s similar to other spam messages.
Overall, it’s a good thing to have though I am not sure how useful this would be for the average Gmail user. All a Gmail user wants is that the spam messages end up in spam and not the ones that should not be there. It works like that most of the time but there’s still some path to be covered to attain 100% accuracy on that front.