[BALUG-Test] And now IPv4 email/SMTP/lists should be originating from the new IPv4 IP

[Michael Paoli]

And yet another test ... ought be a "good" one this time.  ;-)
I *temporarily* disabled the IPv6 IPs - to force IPv4 (yes, there
are other ways ... but for the relatively quick-and dirty ...
also still testing and flushing out any minor issues that may
remain in the full
/etc/network/interfaces ifup/ifdown functionality).

Also, relevant SPF records updated (alas, had dropped TTLs, and queued
the changes, but forgot to get 'em in earlier) ... so that part
of it ought work now too (and might otherwise prevent delivery,
and rightfully so - especially with -all).

> From: "Michael Paoli" <Michael.Paoli@cal.berkeley.edu>
> Subject: Re: [BALUG-Test] And now IPv4 email/SMTP/lists should  
> be	originating from the new	IPv4 IP
> Date: Sun, 15 Dec 2019 07:44:52 -0800

> Drats ... didn't actually go via IPv6 ... will test more later.
>
>> From: "Michael Paoli" <Michael.Paoli@cal.berkeley.edu>
>> Subject: Re: [BALUG-Test] And now IPv4 email/SMTP/lists should  
>> be	originating from the new	IPv4 IP
>> Date: Sun, 15 Dec 2019 07:37:05 -0800
>
>> And one more test, with IPv6 temporarily disabled, to force IPv4 ...
>>
>>> From: "Michael Paoli" <Michael.Paoli@cal.berkeley.edu>
>>> Subject: [BALUG-Test] And now IPv4 email/SMTP/lists should be  
>>> originating from the new	IPv4 IP
>>> Date: Sun, 15 Dec 2019 07:11:33 -0800
>>
>>> And now IPv4 email/SMTP/lists should be originating from the new IPv4 IP,
>>> traffic may be via IPv4 or IPv6 (no change on the IPv6), but at least
>>> for that traffic going over IPv4 ...
>