If you are concerned about your computers security then you should look into using an email address reverse lookup when you get an email from an unknown source. There are many anonymous email addresses and these emails may contain questionable content or even a virus or malware that can infect your computer, steal your personal information or mess up your operating system
A reverse email service operates in the same way as a reverse telephone services as it takes the email address and then see who registered to get this email address. However since you doesn't need any proof of identity in order to get an email account this may not help too much. However if you have any doubts about the email then you shouldn't open it.
The best websites to use are professional reverse lookup companies as they will provide you with accurate information. Many of the free services will be a complete waste of time because you will not get any worthwhile information or you may need to pay for additional information after the preliminary search.
Professional websites will require a modest fee or subscription service for you to use their lookup. You also will have access to other tools and features that are not available at other sites. You also have the choice to pay for unlimited searches or pay per search. Many people prefer the pay per search option.
This second option, pay per search, is the most popular choice. Many times the free sights will not let you access the result sunless you pay a fee so you should be wary.
There are many excellent reverse email lookup websites and you should read reviews and success rates to choose a good website.