Skip to main content

email - Adding an SPF record for a 3rd party, but don't have one for my own domain

itemprop="text">

We have a 3rd party service sending
some email on our behalf. They are using our domain name in their outgoing emails. They
have requested we configure an SPF record for
them.



We do not currently have an SPF record
defined for our own domain, which is the same one the 3rd party is
"spoofing".




My concern is that if we
add a record for a 3rd party without defining our own as well that mail originating from
our servers could be rejected.



Is my concern
valid?



Answer




If you have no SPF record then receivers
will generally fail safe and accept your email (although that's starting to change). As
soon as you provide an SPF record you must include all legitimate
mail senders, because otherwise the ones not listed could be treated as possible forgery
sources.



Strictly speaking, you can
include ~all or ?all and avoid listing
all your mail senders, but if you do that you won't get any benefit from the SPF record
other than for testing that it's otherwise
accurate.



Ideally your third parties
will already have a generic SPF record and you can just add the
include:spf.thirdparty.dom element to your record. If they
don't you might well want to create your own record for them and chain it youself
anyway, so that it's easy for you manage
administratively.




For example, if you
are
contoso.com:



thirdparty1.spf.contoso.com
            txt 'v=spf1 ... -all' # list their mail senders for
            you
thirdparty2.spf.contoso.com txt 'v=spf1 ... -all' # list their mail
            senders for you
spf.contoso.com txt 'v=spf1 ... -all' # list your mail
            senders
contoso.com txt 'v=spf1 include:spf.contoso.com
            include:thirdpart1.spf.contoso.com include:thirdparty2.spf.contoso.com
            -all'


/>


Some useful
resources:




Comments

Post a Comment

Popular posts from this blog

iLO 3 Firmware Update (HP Proliant DL380 G7)

The iLO web interface allows me to upload a .bin file ( Obtain the firmware image (.bin) file from the Online ROM Flash Component for HP Integrated Lights-Out. ) The iLO web interface redirects me to a page in the HP support website ( http://www.hp.com/go/iLO ) where I am supposed to find this .bin firmware, but no luck for me. The support website is a mess and very slow, badly categorized and generally unusable. Where can I find this .bin file? The only related link I am able to find asks me about my server operating system (what does this have to do with the iLO?!) and lets me download an .iso with no .bin file And also a related question: what is the latest iLO 3 version? (for Proliant DL380 G7, not sure if the iLO is tied to the server model)
Post a Comment
Read more

linux - Awstats - outputting stats for merged Access_logs only producing stats for one server's log

I've been attempting this for two weeks and I've accessed countless number of sites on this issue and it seems there is something I'm not getting here and I'm at a lost. I manged to figure out how to merge logs from two servers together. (Taking care to only merge the matching domains together) The logs from the first server span from 15 Dec 2012 to 8 April 2014 The logs from the second server span from 2 Mar 2014 to 9 April 2014 I was able to successfully merge them using the logresolvemerge.pl script simply enermerating each log and > out_putting_it_to_file Looking at the two logs from each server the format seems exactly the same. The problem I'm having is producing the stats page for the logs. The command I've boiled it down to is /usr/share/awstats/tools/awstats_buildstaticpages.pl -configdir=/home/User/Documents/conf/ -config=example.com awstatsprog=/usr/share/awstats/wwwroot/cgi-bin/awstats.pl dir=/home/User/Documents/parced -month=all -year=all...
Post a Comment
Read more

linux - How can I get my mediawiki to stop thinking I have cookies disabled?

I've searched half a day for how to resolve this issue, and can't figure it out. Shortly after I made my wiki a simple private wiki according to the instructions at Mediawiki's website, it started giving me this weird login error message: Wiki uses cookies to log in users. You have cookies disabled. Please enable them and try again. If I remove those private wiki settings, the error disappears, even if I try logging in. But I need it to be a private wiki for only my team. So what do I do? Here's what I've done so far. Just to be safe, after ever change, I try rebooting Apache using: sudo /etc/init.d/apache2 restart In my php.ini file, I have the following set: session.save_path = "/var/lib/php5" session.cookie_secure = secure session.cookie_path = /tmp session.cookie_domain = my server's internal URL (should I even set this? this field was blank before, but not commented out) session.referer_check = Off I ran the following to ensure that the fold...
Post a Comment
Read more