Hi Eric,
I have DNS, PTR and static IP, I am trying to figure it out what is missing.

—
Ciao,
Remo

> On Sunday, Dec 11, 2022 at 21:25, Eric Broch <ebr...@whitehorsetc.com 
> (mailto:ebr...@whitehorsetc.com)> wrote:
>
> Did go to the link?
>
> What to do if your email is rejected by craigslist email servers
> Is your email is being rejected by our servers with a message like this?
> 554 5.7.1 <yourhost.yourdomain.com[10.10.10.1]>: Client host rejected: 
> please_use_SMTP_relay_of_your_isp,_or_setup_non-generic_dns.
>
> In an effort to curb abuse of our email servers and limit the amount of spam 
> inflicted upon our users, craigslist does not accept email from computers 
> with dynamically assigned IP addresses, or hosts that have generic DNS setup.
>
>
>
> If you get the above message, here's what to do:
>
> The easiest solution is to use the mail server of your ISP to relay your 
> email, as they almost certainly have their DNS setup properly in the way we 
> would like. If you're not sure how to setup your mail client to do this, 
> please contact your ISP.
>
> For tech folks that want to run their own mail server:
>
> If you have a static IP address and want to be able to send email through 
> your own mail server, you will need to contact your ISP and have them setup 
> non-generic DNS for your IP address. Usually this is done via a PTR record. 
> Note that you'll need a matching A record. Again, the easiest solution for 
> most end users is to route their outbound email through the mail server of 
> their ISP.
>
>
> If these suggestions don't work, some people find it easiest to use one of 
> the many free web based email systems.
>
> What is generic DNS?
>
> When you make a connection to our servers, we use your IP address to perform 
> a reverse lookup to find the name listed for your computer in the domain name 
> service. We consider you to have generic DNS if the hostname returned 
> contains:
>
> An IP address
> The words pool, dhcp, dynamic
> The words dsl, ppp, pub
> The words server or host
> The words dial or dialup
> The words cable or modem
> The words host, client, node, cust, customer
> Any other indicators that the hostname is not specific to you or your 
> organization
>
> Still not working?
>
> If you have a static IP address, run a mail server and do not have generic 
> DNS, and are continuing to run into trouble, please send email to 
> postmas...@craigslist.org (mailto:postmas...@craigslist.org). Be sure to 
> include the complete headers and rejection message, so that we're able to 
> determine exactly what is happening.
>
> On 12/11/2022 8:05 PM, Remo Mattei wrote:
> > Hello guys,
> > I get this error from Craigslist which I have not seen before, any 
> > suggestions?
> >
> > Thanks,
> >
> > Remo
> >
> > Connected to 208.82.238.85 but greeting failed.
> > Remote host said: 554 [9A5CB1FE-E09B-4C64-88D6-6D987569FF18@mxi6f] 
> > 208-53-44-243.italy1.com [208.53.44.243] Please use smtp relay of your ISP 
> > or setup non-generic DNS. See: 
> > http://www.craigslist.org/about/help/generic_DNS
> >
> > —
> > Ciao,
> > Remo
> >
> >

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