>From: Dianne Skoll <d...@roaringpenguin.com>
    
>On Mon, 30 Jan 2017 09:06:34 -0500
>Rob McEwen <r...@invaluement.com> wrote:

>> On 1/30/2017 8:54 AM, Matus UHLAR - fantomas wrote:
>> > they do and it has been mentioned:
>> > https://help.yahoo.com/kb/SLN23997.html

>Yahoo Outbound IP addresses | Yahoo Help - SLN23997
>help.yahoo.com
>Yahoo Outbound IP addresses. If you're looking for a list of IP addresses that 
>Yahoo Mail sends emails from, we >have them for you below. Just click a link 
>below to ...

Quick and dirty (I know there are many different ways to do this
so I am not saying this is the only way -- no flaming please.):

elinks -dump https://help.yahoo.com/kb/SLN23997.html | grep -E 
'([0-9]{1,3}\.){3}[0-9]{1,3}(\/([0-9]|[1-2][0-9]|3[0-2]))?' | awk '{print $1}'

>Cool.  So Yahoo uses an HTML page that's a pain to process by
>computer.  Microsoft has  
>https://support.content.office.net/en-us/static/O365IPAddresses.xml,
>which at least is XML.  And Google, so far as I can see, can be mined by
>recursively expanding _spf.google.com.

Everyone else that I have needed to whitelist in postcreen with
postwhite will work fine by recursively expanding out their
TXT SPF record which is exactly what postwhite does.

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