Jason
Thank you for your reply.
I tried to set blank in reply-to header using postman-smtp, but I couldn’t.
It is probably possible to set single e-mal address in reply-to field.
Now I changed the source code of this plugin.
user-submitted-posts.php
< $headers .= “Reply-To: $blog <$to>\n”;
—
> $headers .= “Reply-To: \n”;
Thanks.