Increase in Barracuda IP blocks

A number of folks are talking about a significant uptick in Barracuda IP blocks over the last few days. These blocks appear to be affecting wide ranges of IPs across multiple networks.

Folks have been reaching out to Barracuda through their unblocking form. Many of them are not receiving answers, but some are getting answers that say they may be old listings, and there is no current data to support the listing.

This issue is ongoing, as I was writing this post another ESP posted that they were seeing widespread listings affecting multiple customers. As of 1500 UTC folks are still seeing listings populate.

I did reach out on Twitter and their CS folks are passing the reports on to the correct people inside the company. Updates as I get them.

Update (1900 UTC): Barracuda support is actively responding to issues on Twitter. If anyone is actually a Barracuda customer, they’d like a case filed with support about this. Posters on mailop say Barracuda is aware of the issue and are trying to fix.

June 19: The blocks should be resolving now. More information on the update blog post.

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5 steps for addressing deliverability issues

Following on from my reading between the lines post I want to talk a little bit about using the channels. From my perspective the right way to deal with 99% of issues is through the front door.
Last week I found myself talking to multiple folks in multiple fora (emailgeeks slack channel, mailop, IRC) about how to resolve blocking issues or questions. All too often, folks come into these spaces and start by asking “does anyone know someone at…” Fundamentally, that’s the wrong first question. Even if the answer is yes. It’s even the wrong question if a representative of the company is on the list where you’re asking for help.
If that’s the wrong question, what is the right question? Where can we start to get help with issues when we’re stuck trying to fix a delivery problem we don’t understand?

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Do system administrators have too much power?

Yesterday, Laura brought a thread from last week to my attention, and the old-school ISP admin and mail geek in me felt the need to jump up and say something in response to Paul’s comment. My text here is all my own, and is based upon personal experience as well as those of my friends. That said, I’m not speaking on their behalf, either. 🙂
I found Paul’s use of the word ‘SysAdmin’ to be a mighty wide (and — in my experience — probably incorrect) brush to be painting with, particularly when referring to operations at ISPs with any significant number of mailboxes. My fundamental opposition to use of the term comes down to this: It’s no longer 1998.
The sort of rogue (or perhaps ‘maverick’) behavior to which you refer absolutely used to be a thing, back when a clean 56k dial-up connection was the stuff of dreams and any ISP that had gone through the trouble to figure out how to get past the 64k user limit in the UNIX password file was considered both large and technically competent. Outside of a few edge cases, I don’t know many system administrators these days who are able to (whether by policy or by access controls) — much less want to — make such unilateral deliverability decisions.
While specialization may be for insects, it’s also inevitable whenever a system grows past a certain point. When I started in the field, there were entire ISPs that were one-man shows (at least on the technical side). This simply doesn’t scale. Eventually, you start breaking things up into departments, then into services, then teams assigned to services, then parts of services assigned to teams, and back up the other side of the mountain, until you end up with a whole department whose job it is to run one component of one service.
For instance, let’s take inbound (just inbound) email. It’s not uncommon for a large ISP to have several technical teams responsible for the processing of mail being sent to their users:

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Prepping for EEC


Tomorrow I head off to New Orleans to the EEC conference. It’s my first one and I’m really looking forward to meeting some of the people I only know online.
I’ll be speaking on two panels on Friday:
All You Ever Wanted to Know about Deliverability (But Were Afraid to Ask) at 10:50. This is your chance to ask those questions of myself and other experts in the field. I always enjoy Q&A panels and actually hearing from folks what their big deliverability questions are. (and remember, if you have a question, you can always send one to me for Ask Laura)
and the closing Keynote panel
ISP Postmasters & Blacklist Operators: Defending Consumer Inboxes at 1:10. I’m on a panel with various ISP postmasters, blacklist operators and we’ll be talking about what it’s like dealing with the deluge of mail. For instance, there is a huge outbreak of bot-spam at the moment, and a lot of the filters are struggling to keep up. In fact, I’m a last minute replacement for one filter company as they are in all-hands-on-deck firefighting mode to keep their customers safe.
Hope to see you there!
 

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