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[stefan vincec <paczki AT broadcastre.cc>]

Thanks, I'll try this tomorrow.

> On 13 Sep 2021, at 6:58 pm, Sgiath <sgiath AT sgiath.dev> wrote:
> 
> On 2021-09-10 12:27 PM, Paczki wrote:
>> I am registering an OpenNIC account with a Gmail (I also tried my 
>> self-hosted mail server, which I am sending this e-mail from), but I 
>> have never received the confirmation e-mail that OpenNIC is meant to send.
>> 
>> Checking my Postfix logs on my mail server showed nothing.
>> 
>> If anyone could help me with this I’d really appreciate it.
> 
> Hi, I had the same problem with my self-hosted mail server and I found out 
> that my Postfix configuration was too strict for OpenNIC mail servers. They 
> were 
> not passing the `reject_invalid_helo_hostname` check. I was able to "fix" 
> it by 
> adding this to my configuration:
> 
>      smtpd_helo_restrictions =
>    permit_mynetworks
>    reject_non_fqdn_helo_hostname
>    reject_invalid_helo_hostname
>    reject_unknown_helo_hostname
> +    check_helo_access hash:/etc/postfix/access_exceptions
>    permit 
> 
> And creating file `/etc/postfix/access_exceptions` :
> 
>    util-01.opennicproject.org    OK
>    util-02.opennicproject.org    OK
> 
> (and of course running `postmap access_exceptions`)
> 
> It is probably because OpenNIC does not have PTR record setup correctly:
> 
>    $ drill util-01.opennicproject.org
>    util-01.opennicproject.org.     123     IN      A       168.119.153.26
> 
>    $ drill -x 168.119.153.26
>    26.153.119.168.in-addr.arpa.    86239   IN      PTR     static 
> 26.153.119.168.clients.your-server.de.
> 
> Hope it will help to resolve your issue
> -- 
> Sgiath
> https://sgiath.dev
> GPG: 0x70F9C7DE34CB3BC8
> 
> Why is HTML email a security nightmare? See https://useplaintext.email/