Sender Policy Framework Puns

crate.io | repo

A crate for deconstructing and constructing Spf (Sender Policy Framework) records.

This is the latest release.

Features:

• warn-dns
• strict-dns (using the addr crate)
  • With this feature enabled a syntactically invalid dns host will return an error.

Hey there

I’ll get straight to the point.

We have SPF applied and according to many online spoofing checkers tools it say that spoofing is not possible for our domain.

HOWEVER, our email keep getting spoofed, many people keep getting emails from our domain, emails that does not exist in our mail server and has never been created.

Keep in mind that we have about 100 email account for our employees, so its easy to keep track of each email and its owner.

So is it possible to bypass SPF and send a spoofed email?

Thanks in advance

Hi guys. I've been researching SPF over the last week and there are a couple of things I have not been able to determine.

1. If I add an SPF record to our DNS, will I be able to see which emails have been blocked?
2. What happens to the email if it is blocked? Will the sender of the email get a non-delivery error message or does the email just disappear?

Thanks for your help.

I have just written this letter to a peer I saw was interested in technology issues - he's the chair of the Lords Information Committee which oversees IT in Parliament. Does anyone have any suggestions on who else to send it to - or comments on the letter itself?

Dear Lord Kirkwood,

The Government are currently doing nothing technologically to prevent email spammers impersonating official Government email addresses, or employees. At the moment, it is possible for anyone to send an email which, for those not technically-inclined, looks like a UK government email address. Interestingly, Parliament does use this!

However, there is a technology called "Sender Policy Framework" (SPF) which works by a simple process. It is a completely free system which utilises existing technologies the Government already uses.

The email protocol (called SMTP) permits any computer to send email claiming to be from any email address. This is exploited by spammers who often use forged email addresses, making it more difficult to trace a message back to its sender, and easy for spammers to hide their identity in order to avoid responsibility. I believe that the ability for anyone to forge sender addresses is a security flaw in modern SMTP.

SPF allows the owner of an Internet domain to specify which computers are authorized to send mail with sender addresses in that domain.

Receivers verifying the SPF records may reject messages from unauthorized sources before receiving the body of the message.

A government employee sending an email would send it from an authorised computer, while a spammer pretending to be a government employee would not have access to an authorised computer. This receivers which utilise this technology, which include Gmail and many other large online email providers, would be able to delete the email knowing with 100% confidence it was fraudulent.

I put in a Freedom of Information request to the Cabinet Office and was surprised they had not even discussed implementing this technology. --> http://www.whatdotheyknow.com/request/sender_policy_framework

More information on SPF is available on Wikipedia: --> http://en.wikipedia.org/wiki/Sender_policy_framework

I would be very happy to work with you further on this, perhaps drafting letters or parliamentary questions.

I believe implementing this technology would be valuable both to the Government, in knowing that any email sent out was verifiable as being from a government employee, and to people ac

I have to give a presentation on SPF records on Friday and would love anyone to just dumb it down for me. I just basically need to dumb it down for my audience but I have worked with it very little. Any analogies or simplified explanations of the process from sending mail server to receiving mail server and what exactly goes down would be great. I'm a junior network admin and just have limited experience with DNS across the web if anyone wants to just tackle that and relate SPF to MX records. I'm especially interested now with all the SOPA stuff going down. Thanks guys.

Hello All,

We're currently in the process of migrating to office 365, and our migration is scheduled for Friday at 5pm. Yesterday, I had some users starting to get delivery failures when sending to some external email addresses. For the most part, everything is working fine. The messages vary slightly, but the one today that 2 users could not send to came back with a rejection of "Rejecting for Sender Policy Framework". I get the same error. I've googled the error, but I can't really find what would have caused this error. We've been in the migration process for weeks, but haven't made any changes for at least a week. Has anybody seen this error before? I'm not sure if its the right place, as I don't think its an exchange specific issue, but I figured i'd start here.

I am planning to implement Sender Policy Framework (SPF) in our environment, I do not have any experience in this area and was hoping for some advice from the folks in r/sysadmin on what the best method is and what the look out for (gotchas).

I was thinking to use the below Microsoft wizard for creating the SPF record (Is there a better wizard to be using?):

http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/

Should I only be including my MTA's for creating the record or also my internal Hub transport Exchange servers (I am thinking only my MTA's)?

After creating the record we will publish it on our authoritative external DNS server. Is it as simple as that or are any pitfalls to watch out for?

So the above it to lessen the likelihood of someone spoofing mails to send as our domain (provided others have SPF enabled I assume). Now separately our mail gateways have the option to perform SPF checks on inbound mails. It has several different levels on how to handle mails from domains that do not have SPF records (treat as spam and reject, treat as spam and quarantine, etc). Is it generally recommended to enable this?

Thanks and appreciate any advice.

Hi all,

I've been thinking... for those of you who have a no return/no cancellation policy, how do you handle returns ? As in: what do you do if a parcel gets returned to you for whatever reason (i.e. recipient couldn't be reached or refused to accept the parcel, maybe because they didn't want to pay additional fees/customs) ?

Do you cancel the order ? Refund ? Do a partial refund ? No refund at all ?

I'm curious.

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