Mailster has some internal texts which are used at various locations. By default you can change them on the Text tab in the settings but if you like a more flexible approach you can simple change them by a hook via the mailster_text filter.

Add following snippet to your themes functions.php:

add_filter( 'mailster_text', function( $string, $option, $fallback ) {

    switch ( $option ) {
        case 'confirmation':
            $string = 'Please click on the link in your email confirmation';

    return $string;

}, 10, 3 );

Each time a text string is needed it runs through this method. If the $option is the “confirmation” it replaces the initial string with a new one. All other strings are bypassed and do not get changed.

Available Text snippets

Key ($option) Default Value
confirmation Please confirm your subscription!
success Thanks for your interest!
error Following fields are missing or incorrect
unsubscribe You have successfully unsubscribed!
unsubscribeerror An error occurred! Please try again later!
profile_update Profile updated!
newsletter_signup Sign up to our newsletter
email Email
firstname First Name
lastname Last Name
lists Lists
submitbutton Subscribe
profilebutton Update Profile
unsubscribebutton Yes, unsubscribe me
unsubscribelink unsubscribe
webversion webversion
forward forward to a friend
profile update profile
already_registered You are already registered
new_confirmation_sent A new confirmation message has been sent
enter_email Please enter your email address