Hi Guys! Many thanks for all your help so far! I managed to configure a valid rDNS record to day and the users from the blockings ISPs startet to receive mails again!
Now I use the domain lists.rc-worms.de. If I enter that into the tool Mark mentioned (mxtoolbox.com), everything is stated as fine, except for "Reverse DNS does not match SMTP Banner". Could you please try to explain this a bit for me? I use Postfix as MTA... Many thanks again, Sascha. Am 26.01.2016 3:45 vorm. schrieb "Robert Heller" <hel...@deepsoft.com>: > At Tue, 26 Jan 2016 01:27:24 +0100 Sascha Rissel <mail...@rissel.it> > wrote: > > > > > Dear Mark and all others, > > > > many thanks for your help so far. > > I am just starting to setup this subdomain, Mark advised me to. > > > > One thing regarding the Reverse DNS entry: > > How can it be necessary, to set up this record? Just imagine a server, > > where multiple domains are hosted, but the server only has one IP. > > If the ISPs really require rDNS entries, which suit to the mail > originating > > domain, one would always need a 1:1 mapping of IP and domain, preventing > > multiple domains on a one-IP server, isn't it? > > You just need one 'real' canonical domain name, like lists.rc-worms.de, > and > have a rDNS PTR to lists.rc-worms.de. It does not really matter if there > is a > foo-l...@foobar.com hosted there. What is being objected to is the > name<number>.hosting-provider.tld type of name, as well as things like a > HELO > that does not match, and such. It has the look-and-feel of a spammer > sending > anonymous E-Mails or E-Mails with forged / spoofed addresses (including > spoofed HELO's). Also the list server's MTA should be using the > lists.rc-worms.de name in the HELO. And you probably should also have > a spf record as well. Everything should 'match': the A record, the rDNS PTR > record, the HELO name used, the SPF record, etc. That makes everything look > legit and everything fits together. > > > > > Kind regards, > > Sascha. > > > > 2016-01-26 0:48 GMT+01:00 Mark Sapiro <m...@msapiro.net>: > > > > > On 01/25/2016 03:27 PM, Sascha Rissel wrote: > > > > Hi Mark! > > > > > > > >> In simple terms, it claims your mail server is not properly > configured. > > > >> I don't know what your Mailman server's domain name is, but it > appears > > > >> from the error message that its IP is 62.75.175.182 and that IP has > an > > > >> rDNS PTR record to euve51864.serverprofi24.de. > > > > > > > > this is all pretty correct. > > > > > > > > "euve51864.serverprofi24.de" is the natural name of the vServer, I > am > > > > running. > > > > I don't have a real domain configured, since I mainly just use it for > > > > mailman. > > > > > > > > > As I indicated in a follow-up post web.de is apparently not allowing > > > 'generic' domains any more. > > > > > > > > > > I configured all Mailman lists to use something like <list name>@ > > > rc-worms.de, > > > > where <rc-worms.de> is the www domain of my sports club, whose > > > > administrator I am. > > > > For better readability I named and configured all lists this way, to > use > > > < > > > > memb...@rc-worms.de>, <te...@rc-worms.de> as exlicity reply-to > address > > > and > > > > so on. > > > > > > > > This worked pretty well for years. > > > > Did it now turn into a problem, that reply-to address and domain () > bear > > > a > > > > different IP/rDNS result? > > > > > > > > > That is not the problem as far as I can tell. The problem is that the > > > specific domain you are using for your mail server, > > > euve51864.serverprofi24.de, is now seen as a 'generic' name and is not > > > acceptable to web.de. > > > > > > > > > > Is there something you could suggest in this case? > > > > > > > > Should I maybe configure a subdomain on my vServer, like < > > > lists.rc-worms.de>, > > > > from which the mails will be send from and can bear own DNS config? > > > > > > > > > Yes. lists.rc-worms.de should be good. I would have suggested just > > > rc-worms.de, but that already has an A record pointing to a different > > > server. > > > > > > The issue you will run into is that while you can configure the MTA to > > > identify itself as lists.rc-worms.de and you can create the A record > for > > > it, you don't control the rDNS PTR record for 62.75.175.182. That's > > > controlled by intergenia.de. It may be no problem to get them to > change > > > it, but it could be a stumbling block. You'll find out when you ask. > > > > > > With respect to the underlying issue here, ISPs are getting more and > > > more fussy about only accepting mail from what they consider to be real > > > mail servers. Trying to run a mail server with a dynamic IP or an IP > > > with a 'generic' host name is just not possible if you want reliable > > > acceptance of your mail. > > > > > > -- > > > Mark Sapiro <m...@msapiro.net> The highway is for gamblers, > > > San Francisco Bay Area, California better use your sense - B. Dylan > > > ------------------------------------------------------ > > > Mailman-Users mailing list Mailman-Users@python.org > > > https://mail.python.org/mailman/listinfo/mailman-users > > > Mailman FAQ: http://wiki.list.org/x/AgA3 > > > Security Policy: http://wiki.list.org/x/QIA9 > > > Searchable Archives: > > > http://www.mail-archive.com/mailman-users%40python.org/ > > > Unsubscribe: > > > > https://mail.python.org/mailman/options/mailman-users/mailman%40rissel.it > > > > > ------------------------------------------------------ > > Mailman-Users mailing list Mailman-Users@python.org > > https://mail.python.org/mailman/listinfo/mailman-users > > Mailman FAQ: http://wiki.list.org/x/AgA3 > > Security Policy: http://wiki.list.org/x/QIA9 > > Searchable Archives: > http://www.mail-archive.com/mailman-users%40python.org/ > > Unsubscribe: > https://mail.python.org/mailman/options/mailman-users/heller%40deepsoft.com > > > > > > -- > Robert Heller -- 978-544-6933 > Deepwoods Software -- Custom Software Services > http://www.deepsoft.com/ -- Linux Administration Services > hel...@deepsoft.com -- Webhosting Services > > ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org