add explicit config toggle to disable sendmail

lib/Travelynx.pm

@@ -583,7 +583,8 @@ qq{select * from pending_mails where email = ? and num_tries > 1;}
 	$self->helper(
 		sendmail => sub {
 			state $sendmail
-			  = Travelynx::Helper::Sendmail->new( config => $self->config );
+			  = Travelynx::Helper::Sendmail->new(
+				config => ( $self->config->{mail} // {} ) );
 		}
 	);
 

lib/Travelynx/Helper/Sendmail.pm

@@ -28,7 +28,7 @@ sub custom {
 		body => encode( 'utf-8', $body ),
 	);
 
-	if ( $self->{config}->{db}->{database} =~ m{travelynx_dev} ) {
+	if ( $self->{config}->{disabled} ) {
 
 		# Do not send mail in dev mode
 		say "sendmail to ${to}: ${subject}\n\n${body}";