Sujet : Re: reject=553 5.3.0 127.0.0.2 due to unreachable DNS resolver
De : gtaylor (at) *nospam* tnetconsulting.net (Grant Taylor)
Groupes : comp.mail.sendmailDate : 02. Feb 2025, 23:42:16
Autres entêtes
Organisation : TNet Consulting
Message-ID : <vnosc8$ano$1@tncsrv09.home.tnetconsulting.net>
References : 1 2 3 4 5 6 7
User-Agent : Mozilla Thunderbird
On 2/2/25 14:11, Marco Moock wrote:
That error is fine, but in my case it was 553 and I would like to understand what caused that.
I'll try saying it another way, my -- limited -- understanding is that the `454 4.7.1 Listed in ...' error is only sent when there DNS timeout / failures (multiple times).
I think that Sendmail will return a different (error) message when it successfully looks up the IP address and finds it listed in the (ENH)DNSBL. I think it's entirely possible that the 553 was because the client's IP was listed in the (EHN)DNSBL. The 553 even included the IP address from the listing.
But, as said before, I don't use (ENH)DNSBL and don't have any first hand experience with it.
-- Grant. . . .
reject=553 5.3.0 127.0.0.2 due to unreachable DNS resolver
Re: reject=553 5.3.0 127.0.0.2 due to unreachable DNS resolver