This can generate the string "Mailbox is empty" right after a call to imap_open(). That's not an error. That means something like this is not good enough to know the open failed due to a wrong password or host name or whatever. This
$imap = @imap_open( $mailbox, $user, $pass);
$errors = @imap_errors();
if ( $errors ) {
echo 'Login failed: ' . implode ('; ', $errors );
}
can output "Login failed: Mailbox is empty" which is silly.
Instead, check the return value from imap_open().
$imap = @imap_open( $mailbox, $user, $pass);
if ( ! $imap ) {
$errors = @imap_errors();
echo 'Login failed: ' . implode ('; ', $errors );
}
