This sounds like a great idea. Where do you actually specify AOL's mail servers for this rule?

On Thu, 1 Dec 2016, Fazzina, Angelo wrote:

Hi, I throttle my traffic to AOL and HOTMAIL, maybe you need to do the same for 
I had to lookup each ISP's limits to configure it in Postfix to help with all 
the mail to them getting deferred.

I must say it has been years since users complained about mail not getting 
delivered to those domains, and it used to be weekly.
slowaol_destination_recipient_limit = 10
slowaol_destination_concurrency_limit = 2
slowaol_destination_rate_delay = 30s
slowaol   unix  -       -       n       -       1       smtp

-Angelo Fazzina
Operating Systems Programmer / Analyst
University of Connecticut,  UITS, SSG, Server Systems

-----Original Message-----
From: [] 
On Behalf Of Fongaboo
Sent: Thursday, December 1, 2016 3:36 PM
To: Postfix users <>
Subject: Banned by Yahoo?

I've been getting a lot of these errors for mail sent to Yahoo all of a

421 4.7.0 [TSS04] Messages from temporarily deferred due to user 
complaints -; see 
(in reply to MAIL FROM command))

The included link states:

Error: "421 4.7.0 [XXX] Messages from x.x.x.x temporarily deferred due
to user complaints -" when sending email to Yahoo

This error indicates Yahoo is seeing unusual traffic from your IP
address and/or that emails from your mail server are generating
complaints from Yahoo Mail users.

I checked MXDomainTool and we're not on any blacklists (not that I would
expect that to be related). But I did a thorough check for any config
mishaps that might have us open relaying, but we are closed up tight.

However we do have virtual aliases on hosted domains that ultimately point
to addresses. Undoubtedly, I can reference instances of spam
received to the virtual and then forwarded on to Yahoo's mailserver from

But can they really blame the middleman (us) for mail that is just passing
through our hands? I mean, I understand it's possible for them to do
whatever they please. But mostly just looking for a sanity check that I am
corectly ascertaining what is happening and what they are doing?

I saw some earlier posts on a similar issue with Yahoo, but it related to
rate-limiting rather than 4-hour bans. Not sure if it was the same
instigating factor but they've just changed their policy...

Any ideas welcome... But also looking for a sanity check on one thing I
was thinking of trying:

Find any virtual aliases that point to or addresses...
replace the aliases with a virtual MAILBOX that *forwards* to Yahoo. Then,
as per my configuration, any mail destinated for yahoo will be scanned by
Maia-Mailguard/SpamAssassin before it is allowed to leave for Yahoo.

My hope would be that once yahoo-destinated spam passing through my server
slows down they will unban.

TIA for sanity checks!


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