Milter-greylist

On Tue, 12 Apr 2016, manu@... [milter-greylist] wrote:

> 'Jeremy C. Reed' reed@... [milter-greylist]
> <milter-greylist@yahoogroups.com> wrote:
>
> > Something changed in the past few weeks for me where email from gmail
> > servers is getting more and more delayed (days at a time) and now some
> > mails are never getting delivered (timed out on sending side I assume).
>
> I guess they added more server farms, and the message are resent from
> random IP in pools you need to whitelist.
>
> You can update the whitelist by parsing the logs. Alternatively you

> could trust gm?ail.com's SPF record (racl whitelist domain gmail.com spf

> pass), or update your whitelist based on gmail.com SPF records:
> 64.18.0.0/20

snip

Thanks for the response. I should have provide more details and research
up front. I already had several of these IPs listed in my whitelist.
In addition I already had compiled with SPF and see the delayed emails
were accepted with "are SPF-compliant, bypassing greylist" (so whitelist
is probably redundant).

I see the problem:

/var/log/maillog.2.gz:Apr 9 13:11:14 c-0500 postfix/smtpd[11243]:
NOQUEUE: reject: RCPT from mail-wm0-f67.google.com[74.125.82.67]: 554
5.7.1 Service unavailable; Client host [74.125.82.67] blocked using
dnsbl.sorbs.net; Currently Sending Spam See:
http://www.sorbs.net/lookup.shtml?74.125.82.67;
from=<whatever@...> to= proto=ESMTP
helo=<mail-wm0-f67.google.com>

/var/log/maillog.2.gz:Apr 9 00:40:33 c-0500 postfix/smtpd[7566]:
NOQUEUE: reject: RCPT from mail-io0-f196.google.com[209.85.223.196]: 554
5.7.1 Service unavailable; Client host [209.85.223.196] blocked using
dnsbl.sorbs.net; Currently Sending Spam See:
http://www.sorbs.net/lookup.shtml?209.85.223.196 / Spam Received
Recently See: http://www.sorbs.net/lookup.shtml?209.85.223.196;
from=<anotherwhatever@...> to= proto=ESMTP
helo=<mail-io0-f196.google.com>

I have around 184 of those for google.com mail servers over the past
week. Some are listed by dnsbl.sorbs.net, bl.spamcop.net,
and zen.spamhaus.org.

Maybe I should whitelist these also in postfix.

I also use dnsrbl in greylist.conf:

dnsrbl "SORBS DUN" dnsbl.sorbs.net 127.0.0.10
dnsrbl "SPAMHAUS" zen.spamhaus.org 127.0.0.0/16
dnsrbl "SPAMCOP" bl.spamcop.net 127.0.0.2
dnsrbl "CBL" cbl.abuseat.org 127.0.0.2

racl greylist dnsrbl "SORBS DUN" delay 6h
racl greylist dnsrbl "SPAMHAUS" delay 6h
racl greylist dnsrbl "SPAMCOP" delay 6h
racl greylist dnsrbl "CBL" delay 6h

but I don't see logging for this.