[Mailman-Users] Users complain, they don't receive mails from the list

[Mark Sapiro]

On 01/25/2016 03:11 PM, Mark Sapiro wrote:
> On 01/25/2016 02:48 PM, Sascha Rissel wrote:
>>
>> <some_user at 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 at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan