best practices
DOI vs. COI: The Pointless Word War
It's time for a trip down memory lane. We're going way back. Before "deliverability" was even a recognized industry term, ...
Topic
doi
best practices
The case for and against double opt-in
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...
coi
DELIVTERMS: COI/DOI
DELIVTERMS: the ongoing series here at Spam Resource that helps you decode those pesky deliverability acronyms and technical terms. Today we...
2023
Do you double opt-in? And should you, in 2023?
Double opt-in (also called "confirmed opt-in") can help to prevent list hygiene problems, but some people are dead set against it...
best practices
Chad S. White: 4 Ways to Maximize Double Opt-In Confirmations for Email
Oracle's Chad S. White recently shared four fantastic tips on how to maximize your response rate when implementing a double opt-in (aka...
coi
Does Germany require COI/DOI? (Updated for 2022)
What is COI/DOI? It's just address validation and permission verification -- you send a welcome or verification message and the recipien...
blocking signups
Wombatmail COI/DOI update: Now with reCAPTCHA!
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 lis...
best practices
Fun with Double Opt-in
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...
coi
Subscription Mailbombing: Must Read
SendGrid's Paul Kincaid-Smith's has a post up this morning about the "tsunami of unwanted email" generated by the bad guy...
brian krebs
Do you need COI/DOI? Probably.
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, probabl...
coi
Spamcop: Declines to send reports to ESPs
If you work the abuse desk for an email service provider, you've undoubtably gotten spam reports from angry Spamcop users who think tha...
coi
10 Simple List-Building Tips
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 o...
coi
White House Spam, Signup Forgery, and GovDelivery
As guest blogger Jaren Angerbauer mentioned on Friday , after this whole White House spam email debacle, they promised to "implement me...
coi
Guest Post: Email and the White House
Today's guest post comes to us courtsey of Jaren Angerbauer, the founder and CEO of DeliveryVision , an email delivery consulting firm. ...
doi
Ask Al: Help prevent a bad thing!
Terry writes, "My manager wants to take all of our emails addresses in our "pending" list (ones that haven't clicked the ...
coi
On Political Speech, DOI, and Mr. Poopyhead
Ken Magill (or shall I say, Mr. Poopyhead) makes a funny, yet very insightful point, in his recent article about an email he recently recei...
coi
When Terminology Attacks
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: ...
best practices
Even More on Confirmed Opt-in Best Practices
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...
coi
Double opt-in: For and Against
Double opt-in, confirmed opt-in, email address verification, whatever you call it -- nobody ever universally agrees on whether or not you sh...
coi
If it's good enough for the cops...?
I was pleased to discover today that even the Chicago Police Department utilizes double opt-in for their newsletters signup . I wonder what ...