A lot of the larger places seem to utilize a subdomain scheme like spf1.example.com, spf2.example.com, ... , spfn.example.com and then use include:spf1.example.com, etc... in the main record in the example.com zone.
For example, hotmail.com: ;; ANSWER SECTION: hotmail.com. 3600 IN TXT "v=spf1 include:spf-a.hotmail.com include:spf-b.hotm ail.com include:spf-c.hotmail.com include:spf-d.hotmail.com ~all" ~JasonG > -----Original Message----- > From: Maglinger, Paul [mailto:pmaglin...@scvl.com] > Sent: Friday, September 23, 2011 14:26 > To: MS-Exchange Admin Issues > Subject: RE: spf record length > > Anyone? I just checked ours and it was 736 characters. > > -----Original Message----- > From: Maglinger, Paul [mailto:pmaglin...@scvl.com] > Sent: Wednesday, September 21, 2011 7:50 PM > To: MS-Exchange Admin Issues > Subject: spf record length > > Looking at the RFC on spf length it says that the combined length of the > DNS name and the text of all the records of a given type (TXT or SPF) > should be under 450 characters. Has anyone ran into situations where > they've had to go over that and if so, what did you do? > > -Paul > > --- > To manage subscriptions click here: http://lyris.sunbelt- > software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe exchangelist > > > --- > To manage subscriptions click here: http://lyris.sunbelt- > software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
