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Re: Updating SPF type99 and TXT RR's: Simultaneity is not guaranteed.

2005-08-09 23:14:40


spf-team(_at_)strandhuset(_dot_)net wrote:
----- Original Message ----- From: "Mark Shewmaker" 
<mark(_at_)primefactor(_dot_)com>
To: <spf-discuss(_at_)v2(_dot_)listbox(_dot_)com>
Sent: Wednesday, August 10, 2005 7:59 AM
Subject: [spf-discuss] Updating SPF type99 and TXT RR's: Simultaneity is not guaranteed.


...

So basically, even when a domain owner updates both the SPF type99 and
SPF TXT records simultaneously, the mailservers of the recipients may
see different records for a time, (until the cached records' ttl's run
out.)


Possible solution?
1. Lower the TTL of the current record to something like 1 second.
2. After a period as long as the old TTL, change both records. Including setting the TTL back to the original value.

That is the standard method of updating *anything* in zonefiles  :-)
But there are too many people who don't follow that method :-/

Slainte,
JohnP