postfix-users October 2010 archive
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postfix-users: Re: Is Postfix Checking Spamhaus RBL

Re: Is Postfix Checking Spamhaus RBL

From: Ralf Hildebrandt <Ralf.Hildebrandt_at_nospam>
Date: Fri Oct 22 2010 - 19:34:37 GMT

* Carlos Mennens <>:

> My question is why did a message I send from my client (Thunderbird)
> from my ISP connected PC [] who is on the PBL get
> rejected when my mail server the message was sent from is
> The mail server is not on any PBL so what does it matter
> if my ISP range of AT&T/Bell South is blacklisted. My mail server is
> remote and clean. I don't understand why this message was blocked from
> Spamhaus. My Postfix mail server is not on the ISP network what to
> ever.
> This is the reject email back to me:
> Failed Recipient:
> Reason: Remote host said: 554 Service unavailable; Client host
> [] blocked by;
> The message above is confusing because []
> is NOT That's the IP of where the email originated from
> in my Thunderbird mail client. From that IP it was transfered via SMTP
> [25] to and that IP is '
> I hope that was a bit more clear than my 1st ramble...

Ah, maybe they're looking at all the headers, which is really stupid!

-- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 |