On 01/25/2016 03:11 PM, Mark Sapiro wrote:
On 01/25/2016 02:48 PM, Sascha Rissel wrote:
<some_user@web.de>: host mx-ha02.web.de[212.227.17.8] refused to talk to me: 554-web.de (mxweb107) Nemesis ESMTP Service not available 554-No SMTP service 554-Bad DNS PTR resource record. 554 For explanation visit http://postmaster.web.de/error-messages?ip=62.75.175.182&c=rdns
OK. The recipient's mail exchange server is refusing your mail. web.de's explanation of this is at <http://postmaster.web.de/error-messages?ip=62.75.175.182&c=rdns#nordns>.
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.
In any case you need to ensure the IP address your server sends from has a rDNS (PTR) record pointing to its host name and that host name in turn needs an A record with the same IP address. Also, it should identify itself with this same name in the SMTP HELO or EHLO command.
According to the tool at <http://mxtoolbox.com/SuperTool.aspx?action=smtp%3a62.75.175.182&run=toolpage>, this is all OK, so I don't know why web.de is complaining. I suggest you use the form at <http://postmaster.web.de/en/contact/?ip=62.75.175.182&c=rdns> to ask them.
I looked more carefully at <http://postmaster.web.de/error-messages?ip=62.75.175.182&c=rdns#nordns>, and I'm guessing that web.de has decided that euve51864.serverprofi24.de is a 'generic' name rather than an independent and fully qualified domain name.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan