On Fri, 2010-03-05 at 14:40 +1030, Tim wrote: > On Thu, 2010-03-04 at 13:42 -0700, Craig White wrote: > > At this stage, I simply will not accept mail from any smtp server > > whose forward & reverse DNS don't match. So if you are sending me > > e-mails from server mail.example.com you better have a reverse DNS > > address that tells me that your ip address points to mail.example.com. > > That's a rather bad idea, and simply not workable for an *awful* lot of > people. You *will* be rejecting legit mail with that methodology. > > Although many of us have our own domains, many of them will be hosted by > a service which hosts hundreds or thousands of other sites using virtual > named based hosting. We don't each get an IP, and it's completely > impractical to expect that in an IPv4 world. The reverse IP will point > to the host's domain name, not ours. > > You need to do *better* testing than simply forward and reverse checking > of one domain name. ---- first... at the point where AOL and other big user systems started enforcing that rule, it made total sense for me to do likewise. If you don't have forward/reverse dns resolution for your smtp server, you aren't getting e-mail through to the mail servers with a large user base, you aren't getting through to my servers either. You can stand on a soap box and shout about what you think is practical but if you can't get mail through to the big boys... I actually have a long set of postfix rules which determine which mail gets through - far more than 'simply forward and reverse checking' and I'm surprised that you would think I would do less. I start with greylisting, I also require a full helo/ehlo, valid user, resolvable domain and more. I also use MailScanner which fully scores for spam and also implements phishing, virus checking and much more. I do this for many companies that are my clients and I get absolutely no complaints (and very little spam). Craig -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
