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What is A Valid Email Address Format?

To sign up any platform, everyone needs a valid email address. But the question here is that what are the factors that show the email address is valid. Generally, A valid email address consists of an email prefix and an email domain, both in acceptable formats. The prefix appears to the left of the @ symbol and domain appears to the right of the @ symbol.

For example, in the address, “example” is the email prefix, and “” is the email domain.

In both parts, there are some specifications mentioned online which determine what characters are acceptable for them. Their specifications are called Requests for Comments (RFC). They are published by the Internet Engineering Task Force (IETF) and the Internet Society (ISOC), the principal technical development and standards-setting bodies for the Internet.

Email Prefix

The limit of characters for a prefix is up to 64 characters in length and it can be a combination of any alphabetic characters, numeric values or any of the special character mentioned below,

# ! % $‘ &+ * – / = ? ^ _`. { | } ~

The period character (“.”) is valid for the prefix part with the following restrictions:

  • It is not the first or last character
  • Two or more than two consecutive periods

Email Domain

The Domain name is a series of letters and digits that explains a space on the Internet possessed and controlled by a particular mailbox provider or association. TheDomain part can’t exceed the limit of 255 characters in length and should conform with the specification for host names which is a rundown of dot-separated DNS labels. Each DNS mark must not surpass 63 characters and should comprise of any blend of alphabetic characters, hyphens, and digits. Some of the restrictions apply to the DNS labels.

  • The first and last character cannot be hyphens.
  • Top-level domains cannot be all numeric.

How to Know if an Email Address is Valid?

There are some tricks to know that the email address is valid or not, if a person tells you the wrong email address then there is a way to check the email address with the help of this simple trick whether the email exists or not. A lot of different methods are available to check this, many tools are available online but with the help of this easiest trick, you can check the validity of an email address just in seconds. All you can do is, just open the login page of your email service provider and then click the forgot password button, Enter the email then the message will be pop-up that the email is valid or not.

Some of the examples of valid email addresses are:


Some of the examples of the invalid email address and their faults are:

  •, reason is, the name of the recipient is missing.
  • com, the reason is, symbol of @ is missing between johndoe and
  • com, the reason is, the domain name is missing after the @ symbol and before the top-level domain (.net).
  • john.doe43@domainsample, the reason is, the top-level domain ( is missing.

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