[TriLUG] linux mail servers, RBLs, relays, etc.

[ac via TriLUG]

On Wed, 10 Jan 2018 22:50:44 +0000
David Brain via TriLUG <trilug at trilug.org> wrote:
> Mailgun is relay as a service option - not used it other than for
> home use (have a free test account as my network relay) but seems
> like a good service.
>
mailgun is not that responsive to abuse complaints and is frequently
listed (and then de listed) from all sorts of RBLs same with sendgrid and 
even public esp's like outlook.com 
 
> Note that a commodity cloud IP tends to have a lower 'reputation'
> spam wise anyway for spam filters so that could be an issue (and who
> knows what your 'neighbors' are up too).
> 
very few (if any) RBL's simply list /24 /16 or /8 - unless the range is
rogue, jacked or high change volume vps's which change renters 
every 5 minutes...

imho right now the fastest responders to abuse complaints are yahoo.com
& google.com the esp's that are responsive and quick to stop abuse outbreaks 
are far and few between. more so if it is target or spear phish, or lower volume 
criminal activity. 

Because google weeds out even criminal activity, I would
recommend using google to relay your email, if you want it delivered
each time, on time and to main inbox. - other than that - setup your
own sending smtp server using an ISP with a good abuse management
reputation (even check the ip before using it?) 

2c

Andre   


> David
> 
> On Wed, Jan 10, 2018, 1:19 PM Ron Kelley via TriLUG
> <trilug at trilug.org> wrote:
> 
> > I have used SendGrid in the past with great results.
> >
> >
> >
> > On 01/10/2018 12:53 PM, Dewey Hylton via TriLUG wrote:  
> > > This isn't really a linux question, though I believe it is not
> > > strictly  
> > off-topic because it at least involves linux systems ...  
> > >
> > > I manage multiple linux-based mail servers for different
> > > customers. Most  
> > run Zimbra, but some are running opensmtpd (which I am liking more
> > and more as time wears on). The problem I am running into is with
> > the various RBLs ... and not my usage of them, either. Lots of
> > folks out there leverage the RBLs to determine from what addresses
> > they will accept smtp connections. In more than one instance now I
> > have found outbound mail being blocked due to inclusion in one or
> > more RBL. The pesky part of this is that the RBL listed an entire
> > network based on one or more addresses which are not mine. So I'm
> > being blocked thanks to someone with a similar address. Which means
> > I'm being blocked for no fault of my own. Folks like Spamhaus are
> > basically unresponsive (and when they respond they are
> > unapologetic). I have moved networks multiple times in order to get
> > around this. And that does work - at least for a time. But it is a
> > huge pain in the backside. So now I'm thinking about changing
> > tactics.  
> > >
> > > I have considered spinning up a low cost vm and running my own
> > > relay  
> > (most likely opensmtpd), as moving THAT around would be a LOT
> > easier than moving an entire zimbra instance in some cases.  
> > >
> > > I have also considered a commercial solution. I know that
> > > companies  
> > provide mail relays as a service, and I'm hoping I can find one
> > which protects their reputation enough that they stay off the RBLs.
> > Can anyone here make a recommendation for one or more of these
> > services?  
> > >
> > > Or is there perhaps a better way to tackle this?
> > >  
> >
> >
> > --
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