[clue] SMTP Question

[Mike Staver]

Yeah, I did a check and made sure my IP wasn't on any of them. I have 
made sure to fully implement SPF and DKIM over the last week. Ever 
since, things have improved. I can email yahoo and hotmail directly now. 
I also reached out to both providers after finally finding the proper 
places to do so. So, in between reaching out to them and implementing 
DKIM, one of those things started allowing traffic to flow through to 
their servers once again.

On 12/5/2014 6:38 AM, Mike Shoup wrote:
> Mike,
>
> Have you checked any of the IP reputation scoring systems, such as
> senderscore.org or senderbase.org? It's possible, that while you're not
> blacklisted, your IP has been assigned a poor reputation.
>
> Mike Shoup
>
> On 12/01/2014 05:53 PM, Mike Staver wrote:
>> Sorry for the slow response here - I've been investigating my options.
>> I'm beyond frustrated that this just started occurring. Yeah, I have
>> everything configured correctly - PTR records, SPF, etc. I do not have
>> DKIM set up yet as some as suggested, but I will do that next. What I'm
>> considering doing now is this:
>>
>> 1) For all domains that currently work, continue to send email as normal.
>>
>> 2) For domains like hotmail, yahoo, and any others who are blocking me,
>> I want to configure sendmail to relay via smtp.comcast.net.
>>
>> In order for that to happen, I've found that I can't just send email
>> through their server without creds. So far via googling, I've found how
>> to send specific URLs to smtp.comcast.net for relay. I've also found out
>> how to configure sendmail to use a smart host with authentication. What
>> I can't find is how to do both at the same time. Meaning, I only want to
>> use the smart host for specific domains. I just can't find the proper
>> syntax example to accomplish that yet, but I'm still looking.
>>
>> I've spent the last several weeks talking to Comcast, and they
>> completely blew me off. They are claiming that they aren't the
>> responsible party for my problems, and they are partly correct. Trying
>> to contact Microsoft and Yahoo has been a complete waste of my time.
>> When I email them, I get an automated response and no action. Calling
>> the various numbers Comcast came up with led to disconnected numbers and
>> voicemail hell with no return calls.
>>
>> On 11/14/14, 10:02 AM, Ryan Naef wrote:
>>> Mike,
>>> Do you happen to have PTR records in place to the domain you are sending from?
>>>
>>> Regards,
>>> Ryan Naef
>>> Systems Administrator
>>> Web Development
>>>
>>> Direct: (303) 532-4536, (303) 682-3621
>>> Toll Free: (866) 764-8324
>>> Fax: (877) 495-9165
>>> Email:rnaef at aspdd.com
>>> Web: aspdd.com
>>>
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>>>
>>> -----Original Message-----
>>> From: clue-bounces at cluedenver.org [mailto:clue-bounces at cluedenver.org] On Behalf Of Mike Staver
>>> Sent: Saturday, October 18, 2014 8:01 PM
>>> To: CLUE's mailing list
>>> 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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