Implied opt-in is a strategy is based on the assumption that since people have given you their email addresses, you have permission to send them at least one email. And if you say in it that you would like to follow up that email with further marketing communications of a specific kind unless they objected, then you have obtained their permission to continue.
Some consider this to be a gray area of permission marketing, and others will consider it to be a useful tool to be used in certain situations.
If used carefully, B2B marketers can find it an effective way to legitimately increase their email files. However, check first if your country's legislation allows this practice.
Read an interesting article about implied opt-in written by Page Duffy, principal consultant with JPD Associates.
Tamara Gielen is an independent email and digital direct marketing
consultant with over 10 years of experience in online, email and direct marketing. 
I liked the way your posting highlighted an issue of relevance to me.
I would say that one email is permission marketing. More than one is not unless it is specifically requested.
But I also believe that PM is ideal and it's often unrealistic to limit yourself to it.
As a recruiter, if I have a large relevant database of names and I can't call everyone, I will do an email blast out to people i don't know letting them know about an interesting position in their field.
They can act on it for themselves or pass it on to someone else or it simply keeps them aware of what is happening in their professional environment. That's valuable info.
You might say that my email is semi-PM because it is a targetted market but, still, not many recipients have put up their hands.
Only a few ask to be deleted from my list. My main problem is wondering if many of my emails are marked as spam.
Posted by: Canadian Headhunter | Jun 08, 2006 at 12:11 AM
In Italy it is against the Privacy law.
You must have the consent to send email newsletters.
The only exception are current customers.
Posted by: Eugenio La Mesa | Apr 27, 2006 at 03:20 PM