Re: domain owner discourages use of this host

[Charlotte 🦝 Delenk]

On 11.01.22 10:54, Enrico Morelli wrote:

On Tue, 11 Jan 2022 10:48:53 +0100
Charlotte 🦝 Delenk <lo...@chir.rs> wrote:

Hi,
On 11.01.22 10:40, Enrico Morelli wrote:

Dear all,

sending mail to some external users I receive this error:

Recipient address rejected: Message rejected due to: domain owner
discourages use of this host. (in reply to RCPT TO command))

What means?  Is the problem related to my postfix mail server?

Sounds like an SPF problem.

You may want to add an “mx” to your spf record, since
“genio.cerm.unifi.it” and its IP Address 150.217.146.39 does not
appear to be in your nested SPF record

Thanks, is that something the DNS manager has to do or me on
postfix?

SPF is a DNS TXT record, see https://seanthegeek.net/459/demystifying-dmarc/

--
Charlotte

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