[CentOS] [Off topic] sending mail from Comcast was: Sendmail not working

Sun Apr 19 19:10:33 UTC 2020
S.Bob <sbob at quadratum-braccas.com>

OK, I've fired up a new VM, new CentOS 7 install, now I get this:

# rpm -qf `which sendmail`
postfix-2.10.1-7.el7.x86_64



Can you point me to how to set this up properly? Note that I won the 
psalm19pix.com domain, it's hosted at fastmail.com, and as far as I know 
requires SSL. Can I setup sendmail to use this as it's SMPT connection?


Thanks again...




On 4/19/20 12:39 PM, Jason Pyeron wrote:
>> -----Original Message-----
>> From: S.Bob
>> Sent: Sunday, April 19, 2020 2:26 PM
>> To: centos at centos.org
>> Subject: Re: [CentOS] [Off topic] sending mail from Comcast was: Sendmail not working
>>
>> I followed this guide:
>>
>>
>> https://pepipost.com/tutorials/install-sendmail-server-centos-7/
> Sigh - bad examples for you.... undo if you can.
>
> Postfix provides the "sendmail" utility.
>
> # rpm -qf `which sendmail`
> postfix-2.10.1-7.el7.x86_64
>
>>
>> now I get this:
>>
>>
>> # echo "Subject: sendmail test4" | sendmail kevink at psalm19pix.com
>> [root at kdb-bugs auth]# echo "Subject: sendmail test4" | sendmail -v
>> kevink at psalm19pix.com
>> kevink at psalm19pix.com... Connecting to [127.0.0.1] via relay...
>> kevink at psalm19pix.com... Deferred: Connection reset by [127.0.0.1]
>> Closing connection to [127.0.0.1]
>
> What does /var/log/maillog say ?
>
>>
>>
>> Thoughts?
>>
>>
>> On 4/19/20 11:08 AM, Jason Pyeron wrote:
>>>> -----Original Message-----
>>>> From: Tim Evans
>>>> Sent: Sunday, April 19, 2020 12:50 PM
>>>>
>>>> On 4/19/20 12:38 PM, S.Bob wrote:
>>>>> On 4/19/20 10:36 AM, Tim Evans wrote:
>>>>>> On 4/19/20 12:28 PM, S.Bob wrote:
>>>>>>> All;
>>>>>>>
>>>>>>>
>>>>>>> I installed sendmail via yum, but if I test it like this:
>>>>>>>
>>>>>>>
>>>>>>> The original message was received at Sun, 19 Apr 2020 10:02:56 -0600
>>>>>>> from localhost [127.0.0.1]
>>>>>>>
>>>>>>>       ----- The following addresses had permanent fatal errors -----
>>>>>>> <sbob at quadratum-braccas.com>
>>>>>>>        (reason: 554 5.7.1 Service unavailable; Client host
>>>>>>> [50.243.150.81] blocked using xbl.spamhaus.org.rbl.local;
>>>>>>> https://www.spamhaus
>>>>>>> .org/query/ip/50.243.150.81)
>>>>>> Is 50.243.150.81 your system's IP address?  If so, as this shows, that
>>>>>> IP is on spamhaus' blacklist of addresses. Thus, your sendmail is
>>>>>> working fine.  Problem is elsewhere.
>>>>>>
>>>>>> anything I can do to fix it?
>>>> Assuming this is your IP address, visit https://www.spamhaus.org/lookup/
>>>> and request that it be removed from the blacklisted IP's.
>>>>
>>>> However, looking at the headers from your message, it appears Comcast
>>>> may be your ISP, and this 50.243.150.81 IP address appears to be a
>>>> Comcast address, so you may need to contact Comcast tech support for
>>>> help in getting the blacklist designation removed.
>>> There are a few situations here.
>>>
>>> 1. You are a business customer with a static IP, and are entitled to send/receive SMTP by your ISP
>> (Comcast)
>>> 2. You are a business/residential customer who is allowed to send (not likely allowed to receive)
>> SMTP and you have a domain elsewhere to receive replies to your email
>>> 3. You are a business/residential customer who is NOT allowed to send SMTP except for your ISP
>> (Comcast) provided email.
>>> Only you would know which on for sure is you, but it is very likely #3.
>>>
>>> The advice provided previously is for case #1 - contact Comcast and inform them that your contracted
>> services are not working because of .... and you will need to beable to work with them on testing and
>> suggesting fixes. They have a dedicated support phone number (which they provided you if you are
>> actually a #1 type customer - e.g. gigabit pro, metro Ethernet, etc.)
>>> In case you are a #2 or #3 type customer, you may want to use a smart host configuration - e.g.
>> define('SMART_HOST','[smtp.comcast.net]') . For postfix, use relayhost = [smtp.comcast.net] .
>>> Now when you send mail to that relay it will relay it. This is provided you are entitled to have
>> your email relayed - contact Xfinity customer service for help there.
>>> If using this relay does not work, please post the exchange starting with the HELO (check your
>> maillog or do it by hand with telnet).
>>> --
>>> Jason Pyeron  | Architect
>>> PD Inc        |
>>> 10 w 24th St  |
>>> Baltimore, MD |
>>>
>>> .com: jpyeron at pdinc.us
>>> tel : 202-741-9397
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> CentOS mailing list
>>> CentOS at centos.org
>>> https://lists.centos.org/mailman/listinfo/centos
>> --
>> `When you say "I wrote a program that crashed Windows", people just stare at you blankly and say "Hey,
>> I got those with the system, *for free*".' (By Linus Torvalds)
>>
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-- 
`When you say "I wrote a program that crashed Windows", people just stare at you blankly and say "Hey, I got those with the system, *for free*".' (By Linus Torvalds)