Hi all, Sorry for my poor English. I do not know much about DNS and I really need the advice of experts I've a web server with a smtp serveur (Lumisoft) used just to send mailings from different web sites located on the same machine. This smtp server is innaccessible from outside, juste localhost is able to connect and send mail. No account configured.No MX record is pointing to our IP. Mails are sent using DNS (not with a relay).Sender's email address is variable (for site [URL="http://www.siteA.com"]www.siteA.com[/URL] sender adresse is [email][/email] and for site [URL="http://www.siteB.com"]www.siteB.com[/URL] sender is [email][/email]). We do not host the DNS and we do not have the ability to configure them ourselves. We just asked to create a type A record www that points to our IP address. The problem: mails sent are considered as spam because we have no reverse DNS. Can I ask to an ISP to create a reverse DNS to our server web IP address? Is it possible for them to create a rDNS like [our ip address].in-addr.arpa corresponding to mail.siteA.com while we have no corresponding MX record that points to our IP? And finally, is it possible to have multiple rDNS that point to a single IP address? Thank you for your patience. JLE