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HOME • MANAGE SUBSCRIPTIONS • MEDIA KIT
Opt-in Email Best Practices
by Morgan Stewart, Wednesday, April 30, 2008, 2:00 AM

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The idea of sending an opt-in (or "re-opt-in") campaign to subscribers to verify email permission is not new, but interest in these campaigns is increasing. Over time, a portion of your email list will become unengaged -- which has several negative effects. Unengaged subscribers result in lower response rates and wasted marketing dollars. Re-opt-in campaigns are useful for cleaning old or unengaged subscribers off your list by confirming which subscribers want to continue receiving marketing emails. This results in a healthier list and increased return on investment.

We've worked with email marketing companies on these types of campaigns, helping to conduct tests on different tactics to define some clear best practices. Here are the key ones we have developed for these email messages:

1) Be clear in the subject line. Email subject lines like, "Verify your subscription continue receiving [XYZ]" or "Your subscription will end soon" tend to work well. "Goodbye" was another subject line that worked remarkably well. These campaigns tend to be targeting subscribers who have not responded in a while, so breaking the mold with concise, straightforward, or even provocative subject lines help get people to open the email.

2) Restate your value proposition. This is a simple reminder of what your email program offers. A concise restatement of what your subscribers can expect reminds them of what you are all about -- and what they will miss if they do not confirm their email subscription.

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3) Use YES and NO options. This is huge! The misconception is that if you only offer a "Yes, please subscribe me" option, that more people will react positively by opting into the program. We have tested using a single "Yes" option vs. the "Yes and No" options several times. In every instance the "Yes and No" option resulted in significantly more opt-ins! There is something about seeing both options that drives more people to respond. Maybe these emails seem like less of a gimmick, more genuine, or more serious. Whatever the reason, the reality is that by including that NO option, you will actually get more people to click YES.

In addition, this approach to email opt-in campaigns provides you with clear answers. There are three resulting groups: 1) Those that opt-in, 2) those that opt-out, and 3) those that did not respond (even if they opened the email). This third group of non-responders will be your target for a second request.

4) Send a second request. There are situations where a second request is not appropriate -- for example, if you are trying to clean a list suspected of containing spam-trap addresses. However, if you have used the YES and NO options cited above, the non-responders are a prime target for a second request for email permission. We find that these second requests consistently get nearly the same number of opt-ins as the first, so failing to do so could have a material impact on the success of your campaign. We have worked with organizations that have tried a third request using the same logic, but the drop-off has been substantial. In our experience, two invitations seem to be the right number.

By following this approach, we have been able to significantly cut down on the number of inactive addresses on several clients email lists. More importantly, we have been able to do so with minimal impact on bottom-line results. A common objection to cleaning a list through a re-opt-in campaign is that dormant customers who "might buy at some point in the future" will be lost. While a valid concern, we simply have not seen this in real experience. In no instance have we seen a perceptible drop in revenue following from these programs -- definitely not one that was more than the amount saved through decreased email volume. You can proceed with confidence!

3 people recommend this article. 

6 comments on "Opt-in Email Best Practices"

  1. Morgan Stewart from ExactTarget
    commented on: April 30, 2008 at 2:19 PM
    Thanks for the positive feedback. There are a lot of ways to leverage the concept and the recommendations to use surveys and incentives are excellent.

    On the survey front specifically, I am consistently encouraged by the high response rate surveys get. Similar to these opt-in emails, we get the best response to simple subject lines like, "Survey: We want to hear from you", and it has also proven itself to be an excellent way to re-engage subscibers.

    I have also found it challenging to convince marketers it is the "right thing to do", especially if the marketer is of the "email is just cheap direct mail" mindset. A couple thoughts there:

    1) If the program is large, then there is a financial case to be made. This argument simply does not resonate with marketers running smaller programs.

    2) Start by working on the general mindset, "Are we sending emails to a 'list'? Or are we sending emails to customers?" Then focus on the negative brand impact of annoying customers with irrelevant messages.

    3) As Chad mentions, unengaged subscribers may be a deliverability timebomb--why risk it?

  2. Philip Crawford from BlueFish Group
    commented on: April 30, 2008 at 11:11 AM
    Great article Morgan. I'd like to add one thing. It seems many disengaged subscribers are simply not getting the value they wish from the email sends. A short survey (2-5 questions) can help the subscriber feel they are being courted - that their opinion matters.

    The issue I'm very interested in is how do we convince marketers of the value of this process. Most seem to discount the negative effects of sending emails to disengaged subscribers, while over valuing the possibility that "some day" they might click a link and buy something. These marketers usually look at the equation in such a way that it costs them nothing to continue to send these extra emails (usually), and that there is a chance (albeit small) that they can get some sales from these subscribers. They thus choose to not clean their list.

    I'd certainly be interested in ideas for convincing more marketers to perform this cleaning process as it would help email marketing overall.

  3. Jacob Fanning from Flightpath
    commented on: April 30, 2008 at 10:50 AM
    Great article Morgan. One other tactic you might consider using is asking those non-responders to declare preferences, especially for those companies that typically send out broadcast e-mails. Perhaps the reason they are not responding is that you just haven't sent them anything of interest to them specifically. At that point, you have a choice, segment that audience and send them relevant content or risk losing them altogether. For retailers, you might also consider, especially for that second re-engagement e-mail, including a strong offer (Free Shipping on any order, 20% Off, etc.) to not only encourage them to opt-in, but to get them to make another or even a purchase. The offer shouldn't be your standard offer either. It has to be extraordinary. You could also mail the non-responders less frequently and only send them your stronger offers if you are reluctant to drop them.

  4. John Caldwell from Consultant
    commented on: April 30, 2008 at 10:19 AM
    One thing that marketers need to understand is that removing non-responsive email addresses from their list, in addition to to the delivery concerns Chad mentioned, actually increases their metrics by percentage. For example, if one has a list of 500K and an average 20% (let's say) click rate, and they remove 50k non-responders that metric automagically jumps up to a 22.5% average. I find when explained that way, although some marketers may be skiddish at removing non-responders, the increase in their metrics looks better to their boss.

  5. Chad White from Email Experience Council
    commented on: April 30, 2008 at 10:07 AM
    Nice column, Morgan. I've definitely been getting this question more often. I think the message about purging non-responders is finally sinking in. Marketers hate to see their lists shrink, but the name of the game is engagement. In today's deliverability environment, large numbers of non-responders is a ticking spam-reporting time bomb.

  6. Paula Lynn from Who Else Unlimited; hollywood5459@verizon.net
    commented on: April 30, 2008 at 8:12 AM
    Very good advice. However, Goodbye by itself on the subject line is a spam title and can be easily deleted as I always do.

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MORGAN STEWART


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