Not an authority on this, so take my reply for what you want.

As far as I know this list is used to keep track of ip-addresses by ISPs
for home-addresses, which are not intended to be used for outgoing mail.

You can whitelist your ip-address on this list yourself and all should
be back to normal.

I faced the same issues and adding my ip did solve the 550s.

Do note that my ip gets removed every year and thus should be re-added
ever year.



On 08/06/17 16:51, Walter Alejandro Iglesias wrote:
> Hello everyone,
> I was using smtpd(8) (static IP and FQDN resolving direct and reverse)
> for a year without problems.  Today sending from my server (from the
> same address I'm using now) to gmail and hotmail they answered the
> following (MAILER-DAEMON answer).
> Sending to gmail addresses:
>   * 550-5.7.1 [] The IP you're using to send
>   mail is not authorized to send email directly to our servers.  Please
>   use the SMTP relay at your service provider instead. Learn more at
>   e1si6736354wra.236 - gsmtp
> Sending to hotmail:
>   * 550 DY-001 (SNT004-MC3F42) Unfortunately, messages from
> weren't sent. Please contact your Internet service
>   provider. You can tell them that Hotmail does not relay
>   dynamically-assigned IP ranges. You can also refer your provider to
> On the hotmail link above the explanaition for code DY-001 is:
>   Mail rejected by for policy reasons. We generally do not
>   accept email from dynamic IP's as they are not typically used to
>   deliver unauthenticated SMTP email to an Internet mail server. If you
>   are not an email/network admin please contact your Email/Internet
>   Service Provider for help. maintains lists of
>   dynamic and residential IP addresses.
> It doesn't happen with yahoo.
> I visited site and found out my IP is included in a list
> called PBL that, as they  explain is not a spammers list, it just
> includes dynamic and "non mail server IP ranges".
> Does someone here know what is "non mail server IP ranges" about?  Or,
> how could my static IP could be taken as dynamic (some DNS faliure at my
> ISP end?).

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