SMTP being blocked by certain providers

Jason Gurtz jason at
Mon Oct 11 13:07:23 PDT 2004

On 10/11/2004 04:39, Declan Moriarty wrote:
> On Sun, Oct 10, 2004 at 10:25:41PM -0500, DJ Lucas enlightened us thusly

>> Oct  9 15:41:20 pinski postfix/smtp[6894]: 151F91BA88: 
>> to=<jd_lucas at>,[], 
>> delay=5, status=bounced (host[] 
>> said: 554 EMail from mailserver at is refused. See 
>> (in reply to RCPT TO command))

> In the example from outblaze, your ip is not blocked, so you should
> forward it to bounce at and ask.

It looks like they use the SORBS dynIP block list.  Happily, they even
point out a howto resource:

Sometimes, as I have found with some of my users who have dsl at home,
people inherit an IP that was previously occupied by a computer with a
zombie or open proxy or whatever.  In my cases, the IP was listed on
multiple blocklists, other than dynamic IP ones.

So, trying to run a dynamic IP'd mail server without a smart host is just
not too good of an idea these days (was it ever?), anyway you look at it.




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