Hi all, we have some problem with our ip reputation on other provider. We are using our postfix server as delivery server for some mailing lists (about 5000/8000 users); after a few days the destination providers (as hotmail, or yahoo) block any message coming from our mta because our IP address is inserted into their black list (not public black list). Is there a way to use postfix as mailing list sender without looking as spammer? I mean is there some setting on main.cf or somewhere to identify my mta server as secure?
Thanks
