BLOG

Tag: audit

Check your tech

One of the things we do for just about every new client coming into WttW is have them send us an email from their bulk mail system. We then check it for technical correctness. This includes things like reviewing all the different From headers, rDNS of the connecting IP, List-Unsubscribe headers and authentication. This is […]

No Comments

Open Relays and Mail Sinks

Email is a “store and forward” protocol. The sender doesn’t connect directly to the recipient to send the mail with just one network hop, rather the sender connects to a mailserver (usually referred to as an “MTA”, short for Mail Transfer Agent) and sends the message there. Once that MTA has received the message it […]

1 Comment

Have you audited your program lately?

A few months ago, I got spammed by a major brand. I know their ESP takes abuse seriously, so I sent a note into their abuse desk. It bounced with a 550 user unknown. I sent another note into a different abuse address, it bounced. I sent mail into their corporate HQ, it disappeared into […]

1 Comment

The perfect email

Email is a fluid and ever changing landscape of things to do and not do. Over the years my clients have frequently asked me to look at their technical setup and make sure that how they send mail complies with best practices. Previously, this was a good way to improve delivery. Spamware was pretty sloppy […]

2 Comments

Thursday mini-audit part 2

A week ago you signed up for your mailing list using a virgin email address. (You didn’t? Maybe you should do that today – there’s no time like Thursday for a quick sanity check!) Check the mailbox for the account you signed up Is the mail you signed up for in the inbox? In the […]

1 Comment

What you should do Right Now – Thursday Mini-Audit

… if your company runs any sort of email marketing, anyway. Right now is the best time to do a mini-audit of your mail campaign. It’ll just take ten minutes, and if you put off doing it until tomorrow it’ll probably never get done. Go to your public-facing company home page. Does it have a […]

2 Comments
  • HE.net DNS problems

    Hurricane Electric had a significant outage of their authoritative DNS servers this morning, causing them to return valid responses with no results for all(?) queries. This will have caused delivery problems for any mail going to domains using HE.net DNS - which will include some of their colocation customers, as well as users of their free services - but also will have caused reverse DNS to fail for most servers hosted by Hurricane Electric worldwide, so if any of your mail is being sent from HE hosted machines you may have seen problems. (We're HE customers so we noticed. Still happy with them as a vendor.)No Comments


  • 65.0.0.0/8 DNS issues

    If you're sending email from any address beginning with a 65 - in 65.0.0.0/8 - it's possible you'll see some delivery problems. Something appears to be broken with dnssec signatures for the reverse DNS zone, leading queries for reverse DNS to fail for anyone using a dnssec aware DNS resolver (which is almost everyone).1 Comment


  • Our green bar certificate is going away

    Later today we'll be switching from an Extended Validation ("green bar") SSL certificate to a Domain Validation certificate. This isn't exactly a planned change but I'm waiting for responses from Comodo before I go into it too much. I'll share some more details next week.3 Comments


Archives