This is part of our directory of the best business software. Email remains one of the highest-return marketing channels available, you own the list rather than renting attention on a platform’s algorithm, but getting it right takes more than a tool; deliverability, list health, and automation design all matter as much as which platform you pick.
Mailchimp: the familiar starting point
Mailchimp is the name most people already know, with a genuinely usable free tier for a small list and a design-friendly template editor that doesn’t require any technical skill. Its automation features have grown considerably beyond simple newsletters, though power users of more advanced segmentation sometimes find its interface less flexible than dedicated competitors as list complexity grows.
ConvertKit: built for creators
ConvertKit is specifically oriented toward individual creators and small content businesses, bloggers, course creators, newsletter writers, rather than broader e-commerce or corporate marketing. Its automation and tagging system is built around a creator’s typical funnel (free content leading to a paid offer) more directly than a general-purpose tool like Mailchimp.
ActiveCampaign: automation depth for growing businesses
ActiveCampaign’s real strength is its automation builder, genuinely sophisticated, branching, condition-based email sequences that go well beyond a simple welcome series. This depth is worth the higher price and steeper learning curve specifically once a business has outgrown basic newsletters and needs true behavioral automation, sending different follow-ups based on what a specific subscriber clicked or purchased.
Klaviyo: e-commerce-specific automation
Klaviyo integrates deeply and specifically with e-commerce platforms, particularly Shopify, to automate emails based on actual purchase and browsing behavior: an abandoned cart reminder, a post-purchase follow-up, a win-back campaign for a lapsed customer. For an online store specifically, this tight e-commerce integration usually outperforms a general email tool retrofitted for the same purpose.
Comparison
| Tool | Best for | Free tier? |
|---|---|---|
| Mailchimp | General small business, familiar interface | Yes |
| ConvertKit | Individual creators and content businesses | Yes |
| ActiveCampaign | Sophisticated behavioral automation | Trial only |
| Klaviyo | E-commerce-specific automation | Yes (limited) |
Deliverability matters more than any feature
The best template and automation in the world doesn’t matter if emails land in spam. Deliverability depends on list hygiene (removing inactive subscribers rather than emailing an old, unengaged list indefinitely), proper domain authentication setup, and consistent sending patterns rather than sporadic bursts. Every tool listed here provides guidance on this, worth actually following rather than skipping, since a damaged sender reputation is slow and difficult to repair once it happens.
Building a list the right way
A smaller, genuinely opted-in list that wants to hear from you consistently outperforms a larger list padded with uninterested or purchased contacts, both in actual results and in deliverability, since low engagement rates signal to email providers that your messages might be unwanted. Growing a list slowly through genuine value (a useful lead magnet, real content worth subscribing for) beats any shortcut involving purchased or scraped email lists, which every reputable provider explicitly prohibits and will suspend an account over.
Common mistakes in email marketing
Emailing too infrequently is a common and understandable instinct, not wanting to be annoying, but it often backfires: an infrequent sender is more likely to be forgotten and marked as unfamiliar (or spam) than one who sends useful content on a predictable, moderate cadence. The opposite mistake, emailing so often that unsubscribe rates climb, is just as damaging. Most successful senders land on a specific, consistent cadence, weekly or biweekly for a newsletter, for instance, rather than an erratic schedule in either direction.
Segmentation: the feature that actually drives results
Sending the same email to your entire list regardless of their interests or behavior is the single biggest missed opportunity in email marketing. Every tool covered here supports segmentation, splitting a list by past purchases, engagement level, or stated interests, and using it consistently tends to produce meaningfully better open and click rates than blasting one generic message to everyone. Start with a simple split, engaged versus inactive subscribers, before building more elaborate segments; even that basic division improves results noticeably for most senders.
Testing before scaling a campaign
Most platforms support A/B testing subject lines or content on a portion of your list before sending the winning version to everyone else. This is worth using even for a modest list size; a subject line that outperforms another by a meaningful margin in a small test will likely do the same across your full list, and the data removes guesswork from decisions that are otherwise easy to get wrong based on personal preference alone.
Compliance considerations beyond unsubscribe links
Beyond the unsubscribe requirement covered below, regulations like GDPR in Europe and similar laws elsewhere impose specific requirements around consent for how you collected an email address in the first place, not just how you let people leave your list. If you have subscribers in regions with strict consent requirements, check that your specific sign-up process, not just your sending platform, meets those requirements, since platform compliance features don’t automatically cover how you originally obtained an address.
Related reading
Back to the full business software directory, our guide to best CRM software for small business for tracking the customers behind your email list, and best e-commerce platforms if Klaviyo’s e-commerce focus is relevant to your business.
Frequently asked questions
How big does my list need to be before email marketing is worth doing?
There’s no real minimum; even a small, genuinely engaged list can produce meaningful results, and building the habit of consistent, valuable email early is easier than trying to start from nothing once a much larger list exists.
Is it worth paying for advanced automation features right away?
Generally no. Start with a free or low-cost tier and simple automations (a welcome sequence, basic segmentation), and upgrade to a more sophisticated tool like ActiveCampaign once you have a specific, concrete automation need the simpler tool can’t handle.
Do email marketing tools handle unsubscribe requests automatically?
Yes, and this is legally required in most jurisdictions; every reputable platform includes an automatic, compliant unsubscribe mechanism, and manually working around it is both against every provider’s terms and against the law in many places.
Can I import an existing customer list into a new email tool?
Yes, but only import contacts who genuinely opted in to receive email from you specifically; every reputable platform requires this and will flag or suspend accounts that import purchased or scraped lists, both a policy violation and generally illegal in most jurisdictions regardless of platform rules.
How do I know if my emails are actually reaching the inbox instead of spam?
Most platforms provide deliverability reporting showing open rates and, in some cases, specific delivery issues. A sudden drop in open rates across your whole list is a common early warning sign of a deliverability problem worth investigating immediately rather than assuming it’s just reduced interest.
