Length restrictions for storing email addresses.

Storing information in a database can lead us to wonder what size to allocate to the storage of this data. For e-mail addresses, RFC 3996 (document describing the technical specifications of the Internet) defines the restrictions on sending and storing e-mails.

Restrictions for sending and storing email addresses

Structure

The email address is made up of two parts, the local address before the @ and finally the domain which respects the same restrictions as domain names.

Maximum length

• The local part can contain up to 64 characters.
• The domain part can have up to 255 characters.
• The full address must not exceed 320 characters.

Plan

Exemple

In the example above the local address user.name must not exceed 64 characters, the @ counts as 1 character and the domain domain.website-example must not exceed 255 characters.