FAQ

Whose side are you on?

whose-side-are-you-on?

A few weeks ago I was on an industry call. We were discussing some changes coming down the pike at the ISPs and filter providers. These changes are going to cause some headache at ESPs and other places that do email but don’t provide mailboxes. During the call I ended up explaining why what the ISPs were doing made sense and how it fit in…

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What is FCrDNS and why do we care

what-is-fcrdns-and-why-do-we-care

It’s been a light blogging month. We’ve been dancing around getting the final plans, financing, and contractors set up for the work we’re doing on the Dublin house and then heading off for our first actual vacation in almost 5 years. But, I wrote half of this answering a question on mailop, so I may as well polish and publish. What is FCrDNS FCrDNS stands…

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Cost of authentication

cost-of-authentication

At the end of last year, Steve wrote a post about the different types of authentication. I thought I’d build on that and write about the costs associated with each type. While I know a lot of my readers are actually on the sending side, I’m also going to talk about the costs associated with the receiving side and a little bit about the costs…

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Identifying domains that don’t accept or send email

identifying-domains-that-don’t-accept-or-send-email

A couple folks have asked me recently about MX records that they don’t understand. These records consist of a single . or they contain localhost or they are 127.0.0.1. In all cases, the domain owners use these records to signal that the domains don’t accept email. What do these records look like? Why do domains do this? In all cases it’s because the domain owners…

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