Postmark vs Unosend (2026): which should you pick?

Pick Postmark if

• Fits if you want password resets kept on a separate stream from your newsletters
• Works for apps that need to look back at exactly what an email said weeks later

Look elsewhere if

• Pricey if you send 50,000 emails a month, at $55 with no yearly discount
• Skip it if you want a free plan to run a small app on, as it's 100 emails a month with no tier until 10,000
• Tight if you're on Basic, with 4 users, 5 sending domains and no inbound email
• Not for you if you want a dedicated IP below 300,000 emails a month, and each one is $50 a month on Pro or higher
• Watch out: DMARC reports are an add-on from $14 a month per domain

Pick Unosend if

• Fits if you send a few thousand emails a month and want no subscription
• Works for developers who only need an API and SMTP relay

Look elsewhere if

• Skip it if you want a recurring free plan, because the 3,000 credits come once at signup
• Watch out: the cards say credits last 90 days with no minimum, while the FAQ data says 6 months and a $20 minimum
• Watch out: the site banner says Unosend is being acquired, with service continuing as normal
• Pricey if you need a dedicated IP, at $30 a month billed annually ($360 a year)
• Too light for marketing email, with no campaign tools on the page

Postmark

• There is no tier between the free 100 emails a month and the 10,000-email paid plans.
• Billing is monthly only; the FAQ says annual plans are not offered yet.
• Basic has no inbound email processing and caps users at 4 and sending domains at 5.
• Dedicated IPs start at $50 a month per IP, need Pro or higher and 300,000 emails a month or more.

Unosend

• The site banner says Unosend is being acquired, with service continuing as normal.
• The pricing cards and the page's structured data disagree: the cards say credits last 90 days with no minimum, while the FAQ data says 6 months with a 5-credit ($20) minimum.
• A dedicated IP is $30 per month, billed annually ($360 a year).
• There is no recurring free plan; the free credits are given once at signup.

Postmark

Email API and SMTP

Send through a REST API with official SDKs or through SMTP, with batch sending, a sandbox mode and migration guides from other providers.

Message streams

Transactional and bulk or broadcast email run on separate sending infrastructure, so marketing sends do not affect password resets and receipts.

Inbound email processing

Pro and Platform turn incoming email into a JSON object and post it to a webhook URL your app handles.

Templates

Responsive templates for welcome emails, password resets and receipts, with a template editor and import tool.

Message history and analytics

45 days of full message content by default, adjustable from 7 to 365 days, with bounce details, open and link tracking and a stats API.

DMARC monitoring

DMARC Digests reports show authentication problems and who is sending with your domain, sold as an add-on from $14 a month per domain.

Unosend

REST API and SMTP relay

Send through an HTTP API or standard SMTP on ports 465 and 587.

Delivery logs

Real-time logs of sends, deliveries, bounces, opens and clicks.

Sending domains

Unlimited domains with SPF, DKIM and DMARC records.

Webhooks and tracking

Webhooks plus open and click tracking.

Auto top-up

Credits can be topped up automatically when the balance falls below a set level.

Dedicated IP

An optional dedicated sending IP for high-volume senders.

Postmark

• Free$0

  100 emails a month, never expires; extra emails cannot be bought on this plan.

• Basic$15

  per month for 10,000 emails

  5 sending domains, 4 users, 45 days of history, no inbound email. Extra emails $1.80 per 1,000; $55 a month at 50,000 emails.

• Pro$16.50

  per month for 10,000 emails

  10 domains, 6 users, inbound email, retention up to 365 days. Extra emails $1.30 per 1,000; $60.50 a month at 50,000 emails.

• Platform$18

  per month for 10,000 emails

  Unlimited domains, servers, streams and users, with inbound email. Extra emails $1.20 per 1,000; $66 a month at 50,000 emails.

• High volumeCustom

  Custom pricing for large senders, arranged through sales.

Unosend

• Starter$4

  one-time top-up per 10,000 emails, used as you go

  Prepaid credits with no subscription, at $0.0004 per email. The pricing cards say credits last 90 days and that you can top up any amount.

• BusinessCustom

  Volume discounts for teams sending 500,000 or more emails, with an account manager, SLA and custom credit validity.

Postmark

• Startups

  $75 credit for bootstrapped companies

  Companies that have launched, are charging for their product and have taken no outside investment can ask support for $75 of account credit.

Unosend

No public discounts listed.