Hi Stefan,

This could also happen because your PTR record of sending IP address
resolves with 3 IPs e:
IP  116.203.31.6 - PTR securetransport.cubewerk.de - IPs 178.254.23.77;
116.203.31.6; 188.68.39.254

I know that technically it is nothing bad but, I can imagine why some
sensors could return errors, especially since the 3 IP addresses are from
different ASNs:
[image: image.png]

I guess those 3 IPs are set as fallback in this situation?


On Mon, Mar 9, 2020 at 11:03 AM Stefan Bauer via mailop <[email protected]>
wrote:

> Never had delivery issues from hetzner-blocks so far (crossing fingers)
> but I'm aware of the past.
>
>
> Looks like there is at least one RBL around, that list our IP as dynamic.
>
> https://www.rbl-dns.com/bl?ip=116.203.31.6
>
> One just have to pay to get de-listed. What a wonderful world.
>
>
> Stefan
>
>
> -----Ursprüngliche Nachricht-----
> *Von:* Andrew C Aitchison <[email protected]>
> *Gesendet:* Montag 9 März 2020 10:47
> *An:* Stefan Bauer <[email protected]>
> *CC:* mailop <[email protected]>
> *Betreff:* Re: [mailop] Ewetel postmaster wanted - your IP 116.203.31.6
> seems to be dynamic - please use the smarthost of your ISP
>
> On Mon, 9 Mar 2020, Stefan Bauer via mailop wrote:
>
> > Any ewetel postmaster around? One of our IPs (subject) get flagged
> > as dynamic during delivery to ewetel. However this IP is static.
>
> I am not surprised that Ewetel has guessed wrong:
>       whois 116.203.31.6 -h whois.ripe.net
> gives a /16 belonging to our old friends Hetzner.
>
> --
> Andrew C. Aitchison                                   Kendal, UK
>                       [email protected]
>
> _______________________________________________
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>


-- 
Pagarbiai,
Vytis Marčiulionis
+37064734475
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