Hi all, I start one thread for 2 problems I have at the moment. But the problems must be looked at together. First problem: I have set my mail-server to be reachable at mail.mydomain.dom. But when I do a reverse lookup of the IP, I get ns.mydomain.dom. Could be a problem with some mailservers. How can I set the reverse-zone of bind, to bring mail.mydomain.dom when I do a reverse lookup? Or better, how do I set it in ISPconfig? The zone-file is generated from ISPconfig, so if I change it by hand, it will be overwritten when I do changes in ISPconfig. My reverse-zone-file looks like this: Code: $TTL 86400 @ IN SOA ns.mydomain.dom. hostmaster.mydomain.dom. ( 2005111601 ; serial, todays date + todays serial # 28800 ; Refresh 7200 ; Retry 604800 ; Expire 86400) ; Minimum TTL NS ns.mydomain.dom. NS ns2.mydomain.dom. 22 PTR mydomain.dom. 22 PTR [url]www.mydomain.dom[/url]. 22 PTR secure.mydomain.dom. 22 PTR mail.mydomain.dom. 22 PTR ns.mydomain.dom. 22 PTR ftp.mydomain.dom. 22 PTR subdomain.mydomain.dom. ;;;; MAKE MANUAL ENTRIES BELOW THIS LINE! ;;;; Second problem: How do I use the SPF records in the right way? I have not found a description in the manuals. What to set as hostname (should this be mail?)? And what are all the other things? I think for this to work, I need to resolve the first problem.