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Sept 30, 2019
Latest Update: 9 July 2019
Email deliverability can really make or break an email marketing campaign. Most marketers know the theory behind boosting deliverability rates – maintaining clean lists, keeping subscribers engaged, building a good sender reputation, and so on. But many also know from experience that you can do everything by the book, and still have your emails mysteriously disappear after being sent.
Based on our email deliverability tests, we’ve confirmed what many marketers have long suspected – different newsletter services do have different deliverability rates. And the differences, in some cases, are quite startling.
As a result, we’ve decided to share our results, and have committed to performing regular tests to make sure our results are always up to date. We’ll continue to add them to this page with each round of tests.
Because we believe deliverability should be an important factor when deciding on which email tool is right for your business, we’ve also now added this as a criterion to each of our reviews.
Table of Contents
These rates represent an average derived from the five email deliverability tests in each testing round.
| Provider | Deliverability %
Aug 2017 |
Deliverability %
Mar 2018 |
Deliverability %
Jan 2019 |
Deliverability %
July 2019 |
|---|---|---|---|---|
| ActiveCampaign | 85.8 | 96 | 97 | 93.8 |
| AWeber | 80.3 | 79.8 | 75.6 | 80.4 |
| Benchmark | 63.9 | 75.8 | 49.2 | 41.8 |
| Constant Contact | 89.74 | 93 | 90.4 | 88 |
| ConvertKit | 92.1 | 88 | 81 | 91.4 |
| Drip | 89.14 | 89.8 | Not tested | 88.8 |
| GetResponse | 87.5 | 78 | 80.6 | 85.4 |
| MailChimp | 87.52 | 82.6 | 81.6 | 90.6 |
| MailerLite | 77.6 | 89 | 92.6 | 94.8 |
| Mailify | Not tested | Not tested | 71.4 | 81.6 |
| SendinBlue | 83.9 | 75.6 | 77.4 | 88.8 |
| Mailjet | Not tested | Not tested | Not tested | 84.8 |
| Newsletter2Go | Not tested | Not tested | Not tested | 83 |
| CleverReach | Not tested | Not tested | Not tested | 79.6 |
| Overall Average | 83.75 | 84.76 | 79.68 | 83.80 |
As you can see, deliverability rates can fluctuate over time. There does however seem to be some consistency between those that perform the best, and those that perform the worst. Specifically, MailerLite, ActiveCampaign and ConvertKit tend to have the highest rates of deliverability, while Benchmark tends to have the lowest. MailerLite is the only provider that has continued to improve significantly every round. For an analysis of the most recent results, see the blog from our latest round of deliverability tests.
Across the board, the average deliverability was 83.8% in our latest round of tests. That means 16.2% of all emails are either completely missing or caught by the spam filters.
This is consistent with Return Path's own research, which found that the average global inbox placement rate was 85%.
It’s no surprise that there’s a direct correlation between low deliverability rates, and high rates of email flagged as spam. Below is a breakdown of where exactly emails ended up (whether it was the main inbox, a secondary tab, spam folder, or if it went missing), in each test round we’ve completed.
Based on these results, we can start to see some general trends:
Thanks to Glockapps.com, we were able to see just how well each newsletter service performed in getting delivered to the four main ISPs – Gmail, Microsoft (Outlook and Hotmail), Yahoo and AOL. Based on our results, you can see that certain ISPs definitely look more favorably upon some tools than on others.
| Provider | Deliverability % Aug 2017 | Deliverability % Mar 2018 | Deliverability % Jan 2019 | Deliverability % July 2019 |
|---|---|---|---|---|
| ActiveCampaign | 100 | 100 | 100 | 95 |
| AWeber | 100 | 100 | 100 | 83 |
| Benchmark | 50 | 100 | 0 | 13 |
| Constant Contact | 50 | 100 | 100 | 95 |
| ConvertKit | 100 | 100 | 100 | 95 |
| Drip | 100 | 100 | Not tested | 86.7 |
| GetResponse | 50 | 100 | 100 | 95 |
| MailChimp | 100 | 100 | 100 | 95 |
| MailerLite | 100 | 100 | 100 | 95 |
| Mailify | Not tested | Not tested | 80 | 84 |
| SendinBlue | 100 | 100 | 100 | 95 |
| Mailjet | Not tested | Not tested | Not tested | 95 |
| Newsletter2Go | Not tested | Not tested | Not tested | 95 |
| CleverReach | Not tested | Not tested | Not tested | 89 |
| Provider | Deliverability % Aug 2017 | Deliverability % Mar 2018 | Deliverability % Jan 2019 | Deliverability % July 2019 |
|---|---|---|---|---|
| ActiveCampaign | 50 | 100 | 100 | 100 |
| AWeber | 0 | 18 | 0 | 56.9 |
| Benchmark | 0 | 0 | 0 | 33.8 |
| Constant Contact | 84.4 | 100 | 100 | 100 |
| ConvertKit | 84.4 | 69 | 75 | 95.4 |
| Drip | 0 | 100 | Not tested | 100 |
| GetResponse | 50 | 20 | 20 | 60 |
| MailChimp | 50 | 24 | 31 | 80 |
| MailerLite | 0 | 100 | 100 | 100 |
| Mailify | Not tested | Not tested | 16 | 75.4 |
| SendinBlue | 50 | 7 | 0 | 78.5 |
| Mailjet | Not tested | Not tested | Not tested | 43.1 |
| Newsletter2Go | Not tested | Not tested | Not tested | 100 |
| CleverReach | Not tested | Not tested | Not tested | 100 |
*Microsoft figures recalculated for rounds 2 and 3 in May 2019 to reflect relevant weighting for Hotmail and Outlook
| Provider | Deliverability % Aug 2017 | Deliverability % Mar 2018 | Deliverability % Jan 2019 | Deliverability % July 2019 |
|---|---|---|---|---|
| ActiveCampaign | 100 | 100 | 100 | 100 |
| AWeber | 100 | 100 | 100 | 100 |
| Benchmark | 100 | 100 | 100 | 20 |
| Constant Contact | 100 | 100 | 100 | 100 |
| ConvertKit | 100 | 100 | 97.5 | 100 |
| Drip | 100 | 100 | Not tested | 100 |
| GetResponse | 100 | 97.5 | 100 | 95 |
| MailChimp | 100 | 100 | 100 | 100 |
| MailerLite | 100 | 100 | 100 | 100 |
| Mailify | Not tested | Not tested | 80 | 85 |
| SendinBlue | 100 | 100 | 97.5 | 100 |
| Mailjet | Not tested | Not tested | Not tested | 100 |
| Newsletter2Go | Not tested | Not tested | Not tested | 60 |
| CleverReach | Not tested | Not tested | Not tested | 100 |
| Provider | Deliverability % Aug 2017 | Deliverability % Mar 2018 | Deliverability % Jan 2019 | Deliverability % July 2019 |
|---|---|---|---|---|
| ActiveCampaign | 7.1 | 100 | 100 | 100 |
| AWeber | 100 | 100 | 80 | 100 |
| Benchmark | 0 | 80 | 100 | 20 |
| Constant Contact | 92.9 | 100 | 100 | 97.1 |
| ConvertKit | 100 | 100 | 100 | 100 |
| Drip | 100 | 100 | Not tested | 100 |
| Get Response | 85.7 | 100 | 100 | 94.3 |
| MailChimp | 100 | 100 | 100 | 100 |
| MailerLite | 100 | 100 | 100 | 100 |
| Mailify | Not tested | Not tested | 74.3 | 62.7 |
| SendinBlue | 85.7 | 100 | 100 | 100 |
| Mailjet | Not tested | Not tested | Not tested | 100 |
| Newsletter2Go | Not tested | Not tested | Not tested | 57.1 |
| CleverReach | Not tested | Not tested | Not tested | 17.1 |
What does this mean? Well, if you have a good sense of who your subscribers’ email providers are (in an ideal world, that would be Yahoo!), you might consider choosing a newsletter service based on this. Of course, that’s often difficult to know. Plus, as our results show, deliverability to ISPs can change over time.
It’s perhaps more useful to just keep an eye out for any red flags. For example, Microsoft have, in the past, applied more stringent filtering to inbound emails, and some newsletter services – such as Benchmark – still really struggle to get through. Though it has been slightly easier to get emails through to Microsoft more recently, your deliverability rates may still be suffering when sending to this ISP.
While the newsletter services were generally able to deliver to Gmail mailboxes just fine, not all ended up in the Primary tab. Perhaps this isn’t a surprise to anyone who’s used MailChimp, but our first two rounds of tests found that MailChimp had a much higher chance of getting relegated to a Promotions tab – even with emails that wouldn’t normally be considered ‘promotional’.
In the latest round, however, this changed – only 20% of MailChimp’s emails to Gmail ended up in Promotions (instead of 100%). Newly tested providers, Mailjet and Newsletter2Go had a much higher chance of landing in Promotions. ActiveCampaign and SendinBlue were the only providers who managed to stay out of the Promotions tab (though 5% went to spam).
| Provider | Aug 2017 % | Mar 2018 % | Jan 2019 % | July 2019 % |
|---|---|---|---|---|
| ActiveCampaign | 0 | 0 | 0 | 0 |
| AWeber | 0 | 0 | 60 | 18.7 (note – 17% went to spam) |
| Benchmark | 20 | 0 | 0 (note – 100% went to spam) | 6.7 (note – 87% went to spam) |
| Constant Contact | 11.4 | 0 | 0 | 20 |
| ConvertKit | 0 | 0 | 60 | 20 |
| Drip | 0 | 0 | Not tested | 14.7 |
| GetResponse | 0 | 0 | 0 | 20 |
| MailChimp | 100 | 100 | 60 | 20 |
| MailerLite | 0 | 0 | 60 | 33.3 |
| Mailify | Not tested | Not tested | 40 (note – 20% went to spam) | 12 (note – 16% went to spam) |
| SendinBlue | 22.9 | 0 | 60 | 0 |
| Mailjet | Not tested | Not tested | Not tested | 40 |
| Newsletter2Go | Not tested | Not tested | Not tested | 54.7 |
| CleverReach | Not tested | Not tested | Not tested | 14.7 |
There’s no telling why some providers get sorted to Promotions and others don’t, as Google’s complex sorting algorithm is kept tightly under wraps. Ending up in Promotions is less than ideal, as your email is likely to get lost in the flood of emails that often make their way to that tab. Then again, if your email really is promotional and your subscribers are used to accessing emails from that tab, it may not be a problem.
Our tests looked at some of the most widely-used newsletter services:
Using Glockapps.com, we ran our first round of testing in August 2017. This round comprised 5 separate tests conducted over several weeks. We wanted to make sure all conditions were equal, so in each test, we:
Over three thousand emails later, we finally had the results from our first testing round. And we found some pretty big differences in deliverability rates between providers – ranging from 64 to 92 percent!
We repeated this very same test round in March 2018, and from July 2019 onwards, we included an HTML email as one of our tests. That was our latest deliverability test and we plan to conduct, on average, one every 6 months.
We’d love to know what the top performers' secret is – and we’re sure some of the other tools do too! What we do know is that the ISPs often have the last say on whether an email lands in an inbox. This means that they have to trust the mail server sending that email; in our case, that means the server used by the newsletter service.
If that same server also happens to be sending out emails for other clients that are considered ‘spammy’, deliverability of your own emails could suffer. Newsletter services, therefore, make it a priority to maintain their server’s reputation. But some are clearly doing a better job of this than others.
When choosing a newsletter service, there are obviously many factors to consider – price, features, usability, and so on. But with these results, we’ve hopefully made it easy for you to shortlist (or discard) a few based on potential deliverability.
Note that we said ‘potential’ – there’s simply no way of knowing for sure how deliverability will play out for each business. Our results can give you a general idea of what you can expect, and what things to look out for, but your own experience may be very different. If so, we’d certainly like to hear about it!
Does this mean marketers are completely powerless when it comes to the success of their campaigns? Not at all. If anything, these results really drive home the importance of understanding your subscribers – for example, how they engage with emails, and what content they’re likely to be interested in – and to tailor your email campaigns to their preferences. That way, even if you don’t have complete control over who gets your email, you’ll at least maximize their effectiveness with those who do.
