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Yes, you can do that using filter 'cp_listing_validate_fields'. As an parameter you'll get a WP_Error object, that you need to return back, see example.



add_filter(...

Yes, one is called SNAP (Social Network Automated Posting). You can download the free version and check out if you want to pay for the upgrade around $50. It takes time to set up your accounts, as...

Also found a solution for a problem where user and admin get two email's

in plugin directory open file confirm-email.php

and just under the

add_action(...

I found solution for hyperlink by my self.

in plugin directory open file confirm-email.php

On line 216 you will find code:

$message .= html( 'p', sprintf( __( 'To complete the activation of...