Best Email Marketing Tools 2026: How to Choose (and Why Deliverability Is a Domain Problem)
By Thomas Lovas Lokoy — researched and drafted with AI assistance, then fact-checked and approved by Thomas before publishing · Editorial policy
The best email marketing tool depends on what you need it to do: GetResponse if you want email, landing pages and webinars in one suite; Mailchimp for the easiest start; Kit (formerly ConvertKit) if you sell digital products to an audience; ActiveCampaign for deep automation; Brevo if you have a large list but send rarely. Whichever you choose, whether your mail reaches the inbox depends mainly on your own domain's SPF, DKIM and DMARC records, which this page covers in detail.
The thing most comparisons of these tools get backwards
Every roundup of email marketing platforms ranks them on deliverability, usually with a precise-looking percentage next to each name.
Those percentages are not measurable from outside the platform. Nobody publishing a comparison page has access to inbox placement data across providers, and the figures that circulate are either vendor marketing or invented. An earlier version of this page carried five of them. They have been removed, because we could not source a single one.
Here is what is actually true, and it is more useful: for a small sender, deliverability is determined mainly by your domain's authentication records, not by which platform you send from. Any reputable tool can put mail in the inbox if your SPF, DKIM and DMARC are correct. None of them can if they are not. If you have not set up mail on your domain yet, how to set up a business email covers the MX, SPF, DKIM and DMARC records in order.
That is the part this site can speak to credibly, so this page covers the platform choice briefly and the domain setup properly.
Choosing a platform: what actually differentiates them
Prices change constantly and vary by contact count, so read the current figure on each platform's own pricing page. What does not change month to month is the shape of each product.
All-in-one marketing suites bundle email with landing pages, forms, webinars and automation. GetResponse is the established example. You are buying a single tool instead of assembling three, which is worth real money if you would otherwise pay for a landing-page builder separately — and worth nothing if you already have one.
Beginner-first platforms. Mailchimp is the most recognised name and the easiest starting point. The trade is that costs climb steeply as your list grows, and automation on the cheaper tiers is limited.
Creator-focused platforms. Kit (formerly ConvertKit) is built around selling digital products to an audience, and its plain-text-style emails suit that. Design flexibility is deliberately limited.
Automation-first platforms. ActiveCampaign has the deepest automation and CRM tooling of the mainstream options. It is the most capable and the steepest to learn; if you do not need conditional multi-branch workflows you will not use most of what you pay for.
Free-tier-first platforms. Brevo's free tier is genuinely usable with a daily send cap rather than a contact cap, which suits low-volume senders with large lists.
Combined email and social. If you are managing both from one place, Vista Social handles social scheduling alongside, which removes a tool rather than adding one.
How to actually choose: count your contacts, list the three things you need it to do, and check the price at your contact count on each vendor's own page. The platforms are more similar than the comparison tables suggest.
The six shapes, side by side
No prices here, and no deliverability percentages. Prices change constantly and vary by contact count, so read the current figure at your own contact count on each vendor's page. What does not change month to month is the shape of the product.
| Platform | Its shape | Buy it when | Skip it when |
|---|---|---|---|
| GetResponse | An all-in-one suite: email plus landing pages, forms, webinars and automation | You would otherwise pay separately for a landing-page builder | You already have one, in which case the bundle is worth nothing |
| Mailchimp | Beginner-first: the most recognised name and the easiest starting point | You want the shortest path from nothing to a first send | Your list is growing, because costs climb steeply and automation on cheap tiers is limited |
| Kit, formerly ConvertKit | Creator-focused, built around selling digital products to an audience | Plain-text-style email suits what you sell | You need design flexibility, which is deliberately limited |
| ActiveCampaign | Automation-first, with the deepest automation and CRM tooling of the mainstream options | You genuinely need conditional multi-branch workflows | You do not, because you will not use most of what you pay for |
| Brevo | Free-tier-first, with a daily send cap rather than a contact cap | You are a low-volume sender with a large list | Not established here |
| Vista Social | Email alongside social scheduling | You manage both from one place and want to remove a tool | Not established here |
The part that decides whether your email arrives
This applies to every platform above, and it is where the real failures happen.
When you send marketing email "from" your own domain, receiving servers check whether your domain has authorised that platform to send on its behalf. Three DNS records do that work:
SPF lists which servers may send as your domain. DKIM adds a cryptographic signature receivers verify against a key published in your DNS. DMARC tells receivers what to do when the first two fail, and where to send reports.
Your email platform gives you the exact values. They go into your domain's DNS.
What Gmail now requires
Google publishes its rules for anyone sending to Gmail accounts in its email sender guidelines. For all senders: set up SPF or DKIM for your sending domain, use a TLS connection, and keep the spam rate reported in Postmaster Tools below 0.3%. For senders of more than 5,000 messages a day to Gmail accounts: SPF and DKIM, a DMARC record, a From: domain aligned with the SPF or DKIM domain, and one-click unsubscribe plus a visible unsubscribe link in marketing messages. Even if you are far below 5,000 a day, meeting the bulk-sender rules from the start costs nothing and means growth never breaks your delivery.
The four mistakes that cause most delivery failures
1. Publishing two SPF records. The most common and the most damaging. If you send from a mail provider *and* a marketing platform *and* an invoicing system, all of them belong in one combined SPF record. Two separate SPF records is a permanent error condition — it does not degrade gracefully, it fails everything.
2. Adding the records in the wrong place. DNS is controlled by whoever your nameservers point to, which is not necessarily your registrar. If you moved nameservers to a web host or a CDN, that is where these records must go. Our DNS explained guide covers how to tell which is authoritative.
3. Setting DMARC to its strictest policy on day one. Start with monitoring only, read the reports, confirm every legitimate sender passes, then tighten. Going straight to a reject policy silently kills mail from senders you forgot about — typically your invoicing or support system.
4. Sending bulk mail from a brand-new domain. A domain with no sending history has no reputation. Volume from a cold domain looks exactly like what spammers do. Warm it up with low volume first.
Two rules that matter more than the platform
Send from a subdomain if you send both marketing and transactional mail. Marketing mail attracts complaints; transactional mail must arrive. Separating them onto different subdomains means a bad campaign cannot damage delivery of your password resets and invoices. This is the single highest-value structural decision on this page and almost no platform comparison mentions it.
Never send marketing email from a domain you do not control the DNS for. You cannot authenticate what you cannot configure.
Getting the domain side right first
If you have not set up email on your domain at all, do that before choosing a marketing platform — the authentication work overlaps, and doing it once is easier than doing it twice. Our guide to business email on your own domain covers the full sequence including SPF, DKIM and DMARC.
If you are still choosing the domain, the how to choose a domain name guide and best domain registrars 2026 come first. And if the domain is registered somewhere you would rather not keep it, move it before you build a sending reputation on it — our transfer guide covers the 60-day lock.
Does the platform choice matter at all?
Yes, but for features and cost rather than for delivery. At small-sender volumes, every reputable platform sends from well-maintained IP pools. The variable you control is your own domain's authentication and your list quality — sending to people who asked for it, and removing those who stop opening.
When should I start paying?
When the free tier's limit starts shaping your decisions rather than your budget doing it — typically once automation becomes the thing you need rather than a nice extra. Growing a list you own is the point; the tool is replaceable and the list is not.
Should I use my registrar's email for marketing sends?
No. Registrar and general mailbox providers are built for ordinary correspondence and usually prohibit bulk sending in their terms. Use a marketing platform for campaigns and keep your mailbox provider for one-to-one mail — ideally on separate subdomains, per the rule above.
What is a good open rate?
We do not publish a benchmark, because we cannot source one that holds across industries, list types and mail clients. Track your own open and click trend over time, and treat clicks and replies as the more reliable signal.
Dedicated tool or built-in email?
Use a dedicated tool for campaigns. Email features built into website builders are usually limited in automation and list management.
Next step
Set up the domain records first, then pick the tool. If the all-in-one shape fits you, our GetResponse review goes through its features in detail. Before your first campaign, check your records against our guide to SPF, DKIM and DMARC.
Frequently asked questions
Which platform gives the most value for a small business between GetResponse, Mailchimp, and ConvertKit?
GetResponse is an all-in-one marketing suite bundling email with landing pages, forms, webinars, and automation, which is valuable if you would otherwise pay for a landing-page builder separately. Mailchimp is the most recognised beginner-first platform. Kit, formerly ConvertKit, is creator-focused and built around selling digital products.
What determines deliverability for a small sender?
For a small sender, deliverability is determined mainly by your domain's authentication records rather than which platform you send from. Any reputable tool can put mail in the inbox if your SPF, DKIM, and DMARC records are correct, and none of them can if these records are not correct.
What are the common mistakes that cause email delivery failures?
Common delivery failures are caused by publishing two SPF records instead of combining them into one, adding DNS records in the wrong place where your nameservers do not point, setting DMARC to its strictest policy on day one instead of starting with monitoring only, and sending bulk mail from a brand-new domain.
Should I use my registrar's email for marketing sends?
No. Registrar and general mailbox providers are built for ordinary correspondence and usually prohibit bulk sending in their terms. You should use a dedicated marketing platform for campaigns and keep your mailbox provider for one-to-one mail, ideally separated onto different subdomains.
Do I need DMARC to send marketing email?
If you send more than 5,000 messages a day to Gmail accounts, yes: Google's sender guidelines require DMARC, SPF and DKIM for bulk senders. Smaller senders need SPF or DKIM, but setting up all three early is the safer default.
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