Way back in 2016, there were a series of blog posts that laid out the reasons both for and against double opt-in. Positioned as "single opt-in versus double opt-in," it was a good poin…
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DELIVTERMS: the ongoing series here at Spam Resource that helps you decode those pesky deliverability acronyms and technical terms. Today we're going to talk about COI and DO…
Double opt-in (also called "confirmed opt-in") can help to prevent list hygiene problems, but some people are dead set against it. I'm not going to change their mi…
What is COI/DOI? It's just address validation and permission verification -- you send a welcome or verification message and the recipient has to click on a link to prove they…
Verifying email addresses through methods akin to what we now think of as confirmed opt-in (COI) or (DOI) isn't a new thing. Mailing list software Majordomo added support fo…
Here's a link to the source of my new double opt-in sign up tool , if you'd like to check it out or install it for your own use. (It is now called WombatMail .) Of course…
SendGrid's Paul Kincaid-Smith's has a post up this morning about the "tsunami of unwanted email" generated by the bad guys out there using botnets to subscript…
In case you've been living under a rock, or you've been lucky enough to not be affected, here's the deal: Some bad guys, probably Russian or Eastern European, have de…
If you work the abuse desk for an email service provider, you've undoubtably gotten spam reports from angry Spamcop users who think that your ESP, your employer, is "re…
Here are ten simple list building tests that I keep in my pocket, to share with folks when they ask. Some are better than others, but most of them are easy, no-brainer things tha…
As guest blogger Jaren Angerbauer mentioned on Friday , after this whole White House spam email debacle, they promised to "implement measures" to verify and validate em…
Today's guest post comes to us courtsey of Jaren Angerbauer, the founder and CEO of DeliveryVision , an email delivery consulting firm. Jaren has more than nine years of expe…
Terry writes, "My manager wants to take all of our emails addresses in our "pending" list (ones that haven't clicked the link for the double opt-in confirmatio…
Ken Magill (or shall I say, Mr. Poopyhead) makes a funny, yet very insightful point, in his recent article about an email he recently received from the Obama campaign. His artic…
I was reading a mailing list today, as I often do. Some random guy, nobody I know, he posted a request for help. He said, more or less: "Hey, blacklist XYZ has listed my do…
Down in the trenches, as it were, I see a lot of miscommunication and misdirection on the subject of confirmed opt-in/double opt-in. Here's some quick notes, thoughts spurred…
Double opt-in, confirmed opt-in, email address verification, whatever you call it -- nobody ever universally agrees on whether or not you should do it. I see a lot of people in t…
I was pleased to discover today that even the Chicago Police Department utilizes double opt-in for their newsletters signup . I wonder what led them to implement their signup for…
Here's a link to a document I wrote back in February, 2006 . It gives an overview of how to implement double opt-in. How does it work? What do you need to be careful about? H…
