We had a ton of trouble at work with email being marked as spam or just bouncing all together from many of the big email providers until we implemented DKIM. We currently use both DKIM signing and SPF records and it really helped with delivery from our mail servers.<br><br><div class="gmail_quote">On Fri Nov 14 2014 at 10:03:10 AM Ryan Naef <<a href="mailto:rnaef@aspdd.com">rnaef@aspdd.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Mike,<br>
Do you happen to have PTR records in place to the domain you are sending from?<br>
<br>
Regards,<br>
Ryan Naef<br>
Systems Administrator<br>
Web Development<br>
<br>
Direct: (303) 532-4536, (303) 682-3621<br>
Toll Free: (866) 764-8324<br>
Fax: (877) 495-9165<br>
<a href="mailto:Email%3Arnaef@aspdd.com" target="_blank">Email:rnaef@aspdd.com</a><br>
Web: <a href="http://aspdd.com" target="_blank">aspdd.com</a><br>
<br>
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-----Original Message-----<br>
From: <a href="mailto:clue-bounces@cluedenver.org" target="_blank">clue-bounces@cluedenver.org</a> [mailto:<a href="mailto:clue-bounces@cluedenver.org" target="_blank">clue-bounces@<u></u>cluedenver.org</a>] On Behalf Of Mike Staver<br>
Sent: Saturday, October 18, 2014 8:01 PM<br>
To: CLUE's mailing list<br>
Subject: [clue] SMTP Question<br>
<br>
Does anybody else here run their own SMTP server on Comcast Business by<br>
chance? I'm currently running CentOS 6.X and have run my own mail server<br>
for the past 20 years or so. I have never, ever had a problem with<br>
people not able to get my emails. Over the last month, I've had many<br>
cases of people not getting my emails anymore. The accounts are on<br>
services including but not limited to:<br>
<br>
Gmail<br>
Hotmail<br>
Yahoo<br>
Random college mail servers<br>
<br>
An example of a bounce back I got this evening:<br>
<br>
... while talking to <a href="http://mx5.oit.ohio.edu" target="_blank">mx5.oit.ohio.edu</a>.:<br>
<<< <a href="http://554-mx5.oit.ohio.edu" target="_blank">554-mx5.oit.ohio.edu</a><br>
<<< 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.<br>
... while talking to <a href="http://mx1.oit.ohio.edu" target="_blank">mx1.oit.ohio.edu</a>.:<br>
<<< <a href="http://554-mx1.oit.ohio.edu" target="_blank">554-mx1.oit.ohio.edu</a><br>
<<< 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.<br>
554 5.0.0 Service unavailable<br>
<br>
I've checked, and my mail server is NOT listed on any spam blacklists. I<br>
now have to help my own mother who uses gmail get my email by directing<br>
her to go to her junk folder and click "This is not junk" on my emails.<br>
I can't tell you how much that frustrates me. The only reason I can<br>
think that this is happening is because I use Comcast Business for my<br>
ISP. Besides switching ISPs, is there anything I can do?<br>
<br>
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</blockquote></div>