You will also learn how to deal with spam if it is already in your system.
To prevent spam, you should not provide a username similar to any of your email credentials.
Sharing Email
Email is the way out for most spam-sending sites.

To prevent spam from most sites, never share your email address on any social sites, etc.
These sites can use your email to send you malicious content and can also start sending you useless content.
So remember that you should only share your email with the verified sites and not on any other sites.

Using the filters, you’re free to decide which emails should get into your main email inbox.
Tools
Like for most purposes, tools are also available for dealing with spam.
Tools like 33Mail, Scr.im, etc.

can filter and block most of the spam for your mail.
These tools provide handy options for the users that can be easily followed to control/prevent spam.
So, these are the various ways to block spam in email successfully.

All these methods can help you prevent email spam.
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