> Date: Thursday, October 26, 2017 08:40:13 -0700
> From: cac...@quantum-equities.com
> To: postfix-users@postfix.org
> 
> On 10/25/2017 12:39 PM, Richard wrote:
>> 
>>> Date: Wednesday, October 25, 2017 11:55:13 -0700
>>> From: cac...@quantum-equities.com
>>> 
>>> Sending an email from a remote machine pretends like it goes out
>>> just fine.  But it never arrives in the server's mail folder. 
>>> Zero goes into maillog, even with systemctl restart postfix.  TLS
>>> is not enabled.
>>> 
>> You have an MX record pointing from delphi-real-estate.com to
>> mail.delphi-real-estate.com
>> 
>>   # dig delphi-real-estate.com mx
>> 
>>   ;; QUESTION SECTION:
>>   ;delphi-real-estate.com.           IN      MX
>> 
>>   ;; ANSWER SECTION:
>>   delphi-real-estate.com. 28800 IN MX  10
>>   mail.delphi-real-estate.com.
>> 
>> but no A record for mail.delphi-real-estate.com. 
>> 
>> You need to get an A-record for mail.delphi-real-estate.com (which
>> will point to its IPnumber) added to the dns entries for your
>> domain at bookmyname.com.
>> 
>> I suspect your test message is sitting on the outgoing mail server
>> you used and you will get delivery warning and failure messages in
>> time.

> My email client finds the smtp server fine and seems to send the
> email successfully.  I can't find it remaining anywhere locally
> except in Sent.

When sending your test message(s) to delphi-real-estate.com, what are
you using for your smtp server, mail.delphi-real-estate.com or
something else?

> 
> I've asked my registrar about this and he says:
> 
>>> There is no example how to set an A record for a mail domain.

>> Hi, For mail you have to use MX not A. So you have to redirect it
>> on canonical address.

While the current practice, this is not technically true:

   > For mail you have to use MX not A

but we won't belabor that point.

> Here's what delphi-real-estate.com looks like:
> 
> www     28800  A   72.251.232.102 
> @       28800  MX  10 mail.delphi-real-estate.com.
> 
> Do you mean I need to set an A record for delphi-real-estate.com ?
> 

No, you don't need an A-record for delphi-real-estate.com (for mail
purposes at least) since you have the MX pointing to
mail.delphi-real-estate.com.

But you need an A-record for mail.delphi-real-estate.com (analogous
to the A-record you have for www.) otherwise no sending MTA will be
able to reach it. 


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