Allow users to login with multiple email addresses on a single WordPress account.

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Multi-Email Login is a WordPress plugin that enables users to associate multiple email addresses with a single account and authenticate using any of them. This solves a common problem where users have multiple email addresses (personal, work, legacy accounts) but want to maintain a single WordPress profile.
Why Use Multi-Email Login?
<ul>
<li>Flexibility: Users can login with whichever email address they have handy</li>
<li>Account Consolidation: No need to create separate accounts for different email addresses</li>
<li>Smooth Transitions: When changing primary email addresses, users can keep both active for seamless access</li>
<li>Business Use: Perfect for team members who use multiple email addresses across different departments or clients</li>
<li>Zero Friction: Works transparently with WordPress authentication—no special configuration needed</li>
</ul>
Features: 
* Multiple email addresses per user (unlimited) 
* Login with any associated email address 
* Seamless WordPress authentication integration 
* Unique email enforcement 
* User-friendly interface 
* No configuration needed 
* No WordPress core modifications 
* Developer-friendly API for finding users by any email address
Security: 
* Email format validation 
* Input sanitization 
* AJAX nonce protection 
* User capability checks 
* Password verification 
* Duplicate prevention
<h3>Developer Usage</h3>
The plugin provides a simple API for developers to work with multiple email addresses:
Find a user by any email address (primary or secondary): 
 $user = melog_get_user_by( ’email’, ‘user@example.com’ );
This function works just like WordPress’s <code>get_user_by()</code> but automatically checks both primary and secondary email addresses.
Instead of: 
 $user = get_user_by( ’email’, ‘user@example.com’ );
Use: 
 $user = melog_get_user_by( ’email’, ‘user@example.com’ );
For other field types (login, ID, slug), it behaves identically to the standard WordPress function.

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