Solved

Help understanding SPF record and modifcation

Posted on 2014-03-19
4
287 Views
Last Modified: 2014-03-20
Help understanding SPF record

Lets say my Internet domain is company.com

The zone file for company.com shows

@                       IN      TXT     "v=spf1 a mx include:abc.com include:_marketing.xyz.com ?all"

1. Does this mean that the SMTP servers at abc.com and _marketing.xyz.com are authorised to send emails for company.com?

2. If company.com authorised another 3rd party to send emails, do I just add another 'include:3rdparty.com' to the the SPF record?
0
Comment
Question by:JCTDD
  • 2
4 Comments
 
LVL 6

Assisted Solution

by:rick81
rick81 earned 100 total points
Comment Utility
here is a nice explanation of spf

https://support.google.com/a/answer/33786?hl=en

http://en.wikipedia.org/wiki/Sender_Policy_Framework

and yes you can add another authorisation server.
0
 

Author Comment

by:JCTDD
Comment Utility
Thanks. I came across that article recently.

What's not clear is if the SPF record implies ALL servers or just one specific server.
0
 
LVL 6

Expert Comment

by:rick81
Comment Utility
i see it as all.  

can anyone else confirm?
0
 
LVL 25

Accepted Solution

by:
Squinky earned 400 total points
Comment Utility
1: yes, all entries are considered, any match will result in a pass
2: yes

The SPF ending in ?all is bad - it effectively renders the SPF useless since it says that anything you've not listed is OK too, which is the same result as not having an SPF at all. You should aim for -all (though you need to be very certain about your mail sources to do that) or at least ~all.
0

Featured Post

Make managing Office 365 email signatures a breeze

Are you using Office 365? Having trouble trying to set up email signatures for your users? Getting stressed out managing multiple signatures? Need an easier way to manage? We have a solution for you, try the most-user friendly and powerful signature management tool on the market.

Join & Write a Comment

Suggested Solutions

This is the first one of a series of articles I’ll be writing to address technical issues that are always referred to as network problems. The network boundaries have changed, therefore having an understanding of how each piece in the network  puzzl…
Creating an OSPF network that automatically (dynamically) reroutes network traffic over other connections to prevent network downtime.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
In this Experts Exchange video Micro Tutorial, I'm going to show how small business owners who use Google Apps can save money by setting up what is called a catch-all email address in their Gmail accounts. By using the catch-all feature, small busin…

728 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now