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Re:How Gmail’s New Inbox Is Affecting Open Rates by thrownaway2424 on Tuesday July 23, 2013 @01:42PM (#6091618)
"Subscribing in the first place" almost always consists of forgetting to uncheck the "default opt-in" -- also known as opt-out, to normal people. There are also services (including Google) who unilaterally change your preferences from opted-out to opted-in.

Personally, I consider any promotional mail that was not double-opted-in (that is I had to take some affirmative action to receive a confirmation link, and then I confirmed it) to be spam. I also consider any promotional materials stapled to transactional mail to be spam. I know I am not unique in this opinion.

Re:How Gmail’s New Inbox Is Affecting Open Rates by heyitsnick on Tuesday July 23, 2013 @02:14PM (#6091852)
>"Subscribing in the first place" almost always consists of forgetting to uncheck the "default opt-in"

Citation needed. Mail Chimp strongly recommends double-opt in, I think it's the default. I very much doubt its "almost always" single opt-in.

Re:How Gmail’s New Inbox Is Affecting Open Rates by MortenK on Tuesday July 23, 2013 @02:40PM (#6092038)
You are right. In Mailchimp you actually can't even disable double opt-in.
Re:How Gmail’s New Inbox Is Affecting Open Rates by gertef on Tuesday July 23, 2013 @04:46PM (#6092785)
So, opt-in is the "default opt-in" for MailChimp users...