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

Mark Sapiro mark at msapiro.net
Mon Jan 25 18:24:56 EST 2016

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[] 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=
> 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=>.
> 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 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=> to ask them.

I looked more carefully at
<http://postmaster.web.de/error-messages?ip=>, 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

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