[Mailman-Users] Comcast, Yahoo, Hotmail blocking us

Bob Brown bbrown at spsu.edu
Sat Sep 1 19:28:59 CEST 2007

> Also, is there a way to find out which major blacklists your server is 
Try one of these:

You should probably check spamhaus.org directly here: 

If you find yourself on one or more blacklists, visit the blacklist's Web 
page for information on removal or whitelisting.

 -- Bob

mailman-users-bounces+bbrown=spsu.edu at python.org wrote on 09/01/2007 
12:48:06 PM:

> Suddenly, these major ISP's were refusing our connections. We are not on
> their blacklists. This all started on one day.
> After a great deal of investigation by my sysadmin and my University IT 
> we have come to the conclusion that it might have been caused by 
> our mail gateway machine. We upgraded from an antiquated PIX to one that 
> lightening fast. Plus we upgraded our bandwidth at the same time.
> So, what is happening is we are delivering the mail so fast that these 
> are rejecting mail because they have thresholds in place that block 
> quantities of mail coming in from the same server in a short time.
> So, the question I have is - is there any way to set mailman so that it
> doesn't send all its copies of a message to yahoo.com for instance all 
> once? Can you break it up? We have 200 yahoo users which is over their
> threshold.
> We are grasping at straws on this one.
> Also, is there a way to find out which major blacklists your server is 
> and also a way to find the addresses you need to request whitelisting? I
> have a feeling there is a repository for this that you can search, but I
> don't know where to find it.
> Thanks for your help.
> Michael
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