[clue] SMTP Question

Mon Nov 3 19:01:08 MST 2014

Mike,

Are you using comcast's servers as your outbound MTA?

If you are a customer of Comcast then I expect you can use their outbound
mail servers.
Configure your mta to use smtp.comcast.net on port 587 (clear text) or 465
(TLS) as your outbound email server.
You'll need your comcast account username and password to authenticate to
it.
You'll probably also want to decorate your SPF with details letting the net
know that comcast is your relay.
Comcast will add DKIM to your message headers.

http://customer.comcast.com/help-and-support/internet/email-client-programs-with-xfinity-email/
http://postmaster.comcast.net/outbound-mail-servers.html

Of course similar things can be done using google, hotmail, mxlogic, yahoo
and the rest.

I speak for myself
chris

On Mon, Nov 3, 2014 at 12:40 PM, Will <will.sterling at gmail.com> wrote:

> You could use an external mail relay to send your mail using a 3rd
> companies IP space.  They sound a little sketchy but cheap enough to be
> worth a try,
>
> http://www.dnsexit.com/Direct.sv?cmd=mailRelay
>
> On Fri, Oct 31, 2014 at 5:08 PM, Mike Staver <staver at fimble.com> wrote:
>
>> And now yahoo....
>>
>>   ----- Transcript of session follows -----
>> ... while talking to mta6.am0.yahoodns.net.:
>>
>> MAIL From:<staver at fimble.com> SIZE=3303
>>
>> <<< 421 4.7.1 [TS03] All messages from 23.31.69.157 will be permanently
>> deferred; Retrying will NOT succeed. See
>> http://postmaster.yahoo.com/421-ts03.html
>> ... while talking to mta7.am0.yahoodns.net.:
>>
>> MAIL From:<staver at fimble.com> SIZE=3303
>>
>>
>> -Mike
>>
>> On Oct 30, 2014, at 4:31 PM, Mike Staver <staver at fimble.com> wrote:
>>
>> Taking your advice, I did create SPF records for my server again. Either
>> way, that was probably long over due. Unfortunately, some mail services
>> which I despise for other reasons, still reject the mail from my server:
>>
>>    ----- Transcript of session follows -----
>> ... while talking to mx1.hotmail.com.:
>>
>>   MAIL From:<staver at fimble.com> <staver at fimble.com> SIZE=678
>>
>>   <<< 421 RP-001 (SNT004-MC2F44) Unfortunately, some messages from 23.31.69.157 weren't sent. Please try again. We have limits for how many messages can be sent per hour and per day. You can also refer to http://mail.live.com/mail/troubleshooting.aspx#errors.
>> ... while talking to mx4.hotmail.com.:
>>
>>
>> Just one more reason to hate hotmail.
>>
>>
>> On 10/20/2014 4:26 PM, Quentin Hartman wrote:
>>
>> 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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>>>
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>>
>>
>>
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