best 10 transactional email providers

at 100,000 emails a month resend costs $35 against roughly $90 at both mailgun and sendgrid. that is the single most surprising number in this ranking, because resend is the newcomer and is usually assumed to be the premium option. thirty days of log retention on standard plans puts it ahead of everything except postmark and smtp2go too.

the developer experience is the reason it exists — react email for jsx-authored templates, idempotency keys, clean errors — and it is why the incumbents suddenly look dated. the free tier of 3,000 a month is real, though capped at 100 a day, so it's for development rather than a small production load.

two things to know before committing. dedicated ips cost $30 a month and are only sold on the scale plan for accounts sending 3,000+ a day, so a mid-sized sender who wants reputation isolation has to jump tiers. and marketing email bills by contact count rather than sends, which is a different unit from everything on this page — mixing both products makes the arithmetic harder than the headline suggests.

the august 2025 restructure is real and large: the pro plan covering 10,000 emails now costs $16.50 against $60.50 before, with basic at $15 for the same volume minus inbound processing. any comparison still quoting the old number is describing a different product.

retention is where it wins outright. 45 days of history as standard, extendable to a full year for $5 a month, against one day at mailgun's basic and three at sendgrid's essentials. for anyone doing customer support against email delivery, that difference is worth more than the price gap.

two caveats. postmark prints no price at 100,000 emails anywhere we could reach — the ~$133 above is calculated from its own published overage rate of $1.30 per thousand on pro, and it makes postmark the priciest entry here at that volume. and dedicated ips cost $50 a month and require you to already be sending 300,000+, which is an odd gate.

$0.16 per thousand emails, flat, with no monthly platform fee on essentials. that is $1.60 at ten thousand and $16 at a hundred thousand, against $75 to $133 for the same volume elsewhere. at a million emails the gap stops being a line item and becomes a budget decision.

the friction is real and worth pricing in. new accounts start in a sandbox and need manual production access approval before they can send to unverified addresses. there's no polished deliverability dashboard at the base tier, and log retention isn't documented on either the pricing page or the regions doc, which is a meaningful gap in a category where retention is the differentiator.

two structural notes. eu data residency comes free by choosing an eu region, which several rivals treat as a paid feature. and the pro and enterprise tiers add $105 and $500 per account per region per month — small print that inverts the value case entirely if you need what they contain.

thirty days of activity storage on both paid tiers, with a paid extension running up to two years. only postmark's $5 annual add-on competes, and smtp2go's baseline is better than mailgun's, sendgrid's and mailersend's entry plans by a factor of ten or thirty.

the pricing is straightforward and mid-field: $10 for ten thousand, $75 for a hundred thousand. that undercuts mailgun and sendgrid at volume by about 17% and postmark by considerably more, while keeping retention that actually supports a support team.

what's missing is disclosure. dedicated ip is available on professional and above but the cost appears nowhere we could reach, and the dedicated page returned 404. eu data residency isn't mentioned at all, and neither is inbound processing. for a vendor doing the hard part well, the public pages leave a lot unanswered.

roughly $5.60 a month for ten thousand emails and around $25 for a hundred thousand makes mailersend the cheapest option here apart from amazon ses, and it comes with a normal dashboard rather than an aws console.

retention is tiered and stated: one day on free and hobby, seven on starter, thirty on professional plus a separate seven-day api log. that ladder is clearer than most rivals manage, though it does mean the cheap plan gives you a single day to notice a problem.

an honest caveat about our own figures. the plan-to-volume mapping came from a rendered pricing table rather than text we could quote verbatim, so treat the prices above as close rather than confirmed and check them at checkout. eu data residency could not be confirmed either — the documentation url returned 404 — and dedicated ips are enterprise-only above 100,000 emails a week, priced on request.

$0.001 per email, no monthly fee, unlimited contacts, and both transactional and marketing sends at the same rate. there are no tier cliffs, no contact-count arithmetic and no plan to outgrow. after reading nine other pricing pages, the clarity is genuinely striking.

the flip side is that the line never bends. a hundred thousand emails costs exactly ten times ten thousand — $100 — which is more than mailgun, sendgrid, smtp2go, resend, mailersend and amazon ses charge for the same volume. that is by design rather than omission, but it means plunk is a small-sender product whatever its scaling story says.

the pricing page also says nothing about dedicated ips, eu data residency, inbound parsing or log retention. for a low-volume project that may not matter; for anything with compliance requirements the silence is the answer.

the eu story is the strongest here after amazon: mailgun states plainly on its pricing page that data can remain in the region of your choice, with no separate charge mentioned. several rivals treat that as an enterprise feature or don't document it at all.

one day of log retention on basic is the problem. that's the $15 plan covering ten thousand emails — the one a small saas actually buys — and it means a customer asking about an email from yesterday morning may already be beyond your ability to answer. foundation gets five days, scale gets thirty.

pricing is mid-field at $15 and $90, with a dedicated ip included at foundation from 100k volume and additional ips at $59. email validation is a separate paid add-on at $1.20 to $1.80 per hundred checks, which is worth noting when comparing against vendors that bundle it.

the free plan is gone. new signups get a 60-day trial at 100 emails a day, then billing starts. that change from may 2025 invalidates most of the recommendations still circulating, and it removes what was for years the reason to start here.

three days of log retention on free and essentials is the second-worst in this ranking. pro and premier get seven, which is still short of postmark's 45 and smtp2go's 30. for a platform sold on visibility and reputation management, that is a strange place to economise.

at the top end it remains genuinely strong: pro bundles a dedicated ip and eu data residency, the mail transfer infrastructure is proven at enormous scale, and overage falls to $0.0005 an email at the largest tiers. getting there is awkward though — sendgrid.com's pricing urls redirect, sometimes in loops, to twilio-branded pages, and the essentials tier covering 100,000 emails has no price printed anywhere we could find.

loops bills by subscribed contacts and lets you send as much as you like to them, transactional included at no additional charge on paid plans. if you email a thousand users forty times a month, that inverts the arithmetic of every per-send vendor here in your favour.

it also means the anchor volumes this ranking uses simply don't apply. there is no price for ten thousand sends because sends aren't the billed unit, and the paid contact tiers sit behind an interactive slider we could not read, so we cannot tell you what a given list size costs.

the free tier — 1,000 contacts and 4,000 sends — is a real starting point. beyond that, nothing on the pricing page addresses dedicated ips, eu data residency, inbound parsing or log retention, all of which the transactional-first vendors here treat as table stakes.

the entry tiers are competitive: 6,000 emails a month free at 200 a day, 8,000 for $9, 15,000 for $17. against sendgrid's abolished free plan and postmark's 100-email allowance, that is a real advantage for a side project or a small product.

above fifteen thousand the pricing disappears. the 50k, 100k, 250k and 500k tiers exist behind an interactive slider that produced no readable figures, so we cannot tell you what mailjet costs at this ranking's own anchor volume. the page notes a dedicated ip becomes available 'for 100k+ plans', confirming those tiers exist without pricing them.

the disclosure gaps run deeper. the support article on statistics and history retention returned 404, so log retention is unknown. eu residency is implied by french vat notices and sinch ownership but stated nowhere as a guarantee. inbound processing isn't mentioned. for a vendor this established, that's a lot of unanswered questions.