[clue] SMTP Question

[Quentin Hartman]

When I've had similar problems, the SPF records did seem to fix the
problem, so my anecdotal evidence suggests that most systems look for SPF
before consulting IP blacklists.

Q

On Mon, Oct 20, 2014 at 3:58 PM, Mike Staver <staver at fimble.com> wrote:

>  Thanks Jim. I was afraid you were going to say that :) What I realized is
> that I could set up SPF records and see if that helps any, but I'm not sure
> how many ISPs pay attention to those.
>
> On 10/19/2014 9:48 AM, Jim Ockers wrote:
>
> Hi Mike,
>
> This doesn't really help you but I had to move my SMTP origin to an IP address outside of Comcast because their IPs are a bad neighborhood with regards to spam.  I found I simply couldn't use it for e-mailing anything important.
>
> It may be getting better now that they filter port 25 and require all outgoing SMTP to go through their mail relay, but the netblocks are still known to be end-user/consumer IPs and will be on various blacklists.
>
> Can you get a virtual server somewhere else that's in a more respectable neighborhood?  That's what I did...
>
> Jim
>
> --
> Jim Ockers, P.E., P.Eng. (ockers at ockers.net <mailto:ockers at ockers.net>)
> Contact info:http://www.ockers.net/ <http://www.ockers.net/>;
>
> -----Original message-----
> > From:Mike Staver <staver at fimble.com>
> > Sent: Saturday 18th October 2014 19:01
> > To: CLUE's mailing list <clue at cluedenver.org>
> > Subject: [clue] SMTP Question
> >
> > Does anybody else here run their own SMTP server on Comcast Business by
> > chance? I'm currently running CentOS 6.X and have run my own mail server
> > for the past 20 years or so. I have never, ever had a problem with
> > people not able to get my emails. Over the last month, I've had many
> > cases of people not getting my emails anymore. The accounts are on
> > services including but not limited to:
> >
> > Gmail
> > Hotmail
> > Yahoo
> > Random college mail servers
> >
> > An example of a bounce back I got this evening:
> >
> > ... while talking to mx5.oit.ohio.edu.:
> > <<< 554-mx5.oit.ohio.edu
> > <<< 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
> > ... while talking to mx1.oit.ohio.edu.:
> > <<< 554-mx1.oit.ohio.edu
> > <<< 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
> > 554 5.0.0 Service unavailable
> >
> > I've checked, and my mail server is NOT listed on any spam blacklists. I
> > now have to help my own mother who uses gmail get my email by directing
> > her to go to her junk folder and click "This is not junk" on my emails.
> > I can't tell you how much that frustrates me. The only reason I can
> > think that this is happening is because I use Comcast Business for my
> > ISP. Besides switching ISPs, is there anything I can do?
> >
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>
>
>
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