Tag Archives: spf

Protecting domains from spammers

Spammers quite often ‘spoof’, or fake, the from address of an email.

As a result of this, many unsuspecting domain owners are being ‘blamed’ for spam that appears to come from their domain.

Fortunately, there is a relatively easy way to protect your domain from this: Publish DMARC policies.

If you are publishing SPF records and signing your email with DKIM, you can publish DMARC policies that tell receiving mail servers what do with emails that don’t align with the SPF and DKIM information.

SPF policies are DNS records that indicate what mail servers your mail is sent from.

DKIM is a way to add digital signatures to your email so that receiving mail servers can verify it was sent from an authorized source and that it wasn’t modified in transit.

Now what if you have a domain that you NEVER send email from?

Protecting those domains from being used in spam is even easier.

Continue reading

Related posts ...
I really wish there was a way to indicate, in DNS, that a domain never
(Read this entire post, as there is a very weird problem described later) It's been
Well, our good friends at Yahoo are at it again. Once again they are deferring
Most ISP's and network providers have specific email addresses that you can report abuse to.

DNS: Sends No Mail

I really wish there was a way to indicate, in DNS, that a domain never sends mail.

That way, if a mail server recieves mail claiming to be from that domain, it can be discarded out of hand.

I’ve got a bunch of domains that JUST do web serving … they never send mail.  If the web server that they are hosted on does send mail, it’s sent from via the midrange.com mail server (and is identified as such).

Continue reading

Related posts ...
Spammers quite often 'spoof', or fake, the from address of an email. As a result
Back in October of 2012 I devised a way of blocking abuse of my mailing
Most ISP's and network providers have specific email addresses that you can report abuse to.
A while ago I added a new anti-spam technique to my mail server setup called