--- title: "Best Postmark Alternatives in 2026: Cheaper Transactional Email That Still Lands" description: "The best Postmark alternatives of 2026 compared: Reloop, Resend, MailerSend, Mailgun, Amazon SES, SendGrid and ZeptoMail on price at 50k and 100k emails, inbound, dedicated IPs, marketing and self-hosting." canonical: "https://reloop.sh/blog/best-postmark-alternatives" last-updated: "2026-10-25" --- # Best Postmark Alternatives in 2026: Cheaper Transactional Email That Still Lands > For the site documentation index, see [llms.txt](/llms.txt). Docs index: [llms-docs.txt](/llms-docs.txt). Marketing corpus: [llms-full.txt](/llms-full.txt). Docs corpus: [llms-full-docs.txt](/llms-full-docs.txt). Product skill: [skill.md](/skill.md). Prefer markdown URLs (append `.md`) when available. > The best Postmark alternatives of 2026 compared: Reloop, Resend, MailerSend, Mailgun, Amazon SES, SendGrid and ZeptoMail on price at 50k and 100k emails, inbound, dedicated IPs, marketing and self-hosting. Source: https://reloop.sh/blog/best-postmark-alternatives Published: 2026-10-25 **The short version:** if you're leaving Postmark because of the bill, **Reloop** sends the same transactional mail for $10 at 50,000 emails a month (Postmark Basic with overage is $87), adds inbound mailboxes, campaigns and automations, and is open source. **Resend** is the closest match on developer experience. **Amazon SES** is the cheapest raw pipe if you'll build the rest yourself. We build Reloop, so weigh our pick accordingly. Every competitor price below comes from the provider's public pricing page, linked in each section, and each section says where that provider beats us. --- ## Why teams look for a Postmark alternative Postmark is good at what it does. It has been transactional-first for over a decade, and its **message streams** keep bulk mail from hurting your transactional reputation. People don't usually leave because mail stops arriving. They leave because of what it costs and what it doesn't do: - **Overage adds up fast.** Basic is $15 for 10,000 emails, then $1.80 per extra 1,000. At 50,000 a month that's about $87; at 100,000, about $177. - **The free plan is a test plan.** 100 emails a month, enough to try the API, not to run a small app. - **Inbound needs Pro.** Inbound processing isn't on Basic. - **Dedicated IPs are gated.** $50 a month per IP, for senders above 300,000 emails a month. - **It isn't a marketing platform.** There's a broadcast stream, but no contact database with segments and no automation builder. - **Hosted only.** No source, no self-hosting. If none of those bother you, stay. If one does, here are the options. --- ## Top picks at a glance | Category | Pick | Why | |---|---|---| | **Best overall Postmark alternative** | Reloop | $10 for 50k, inbound mailboxes, campaigns, open source | | **Closest developer experience** | Resend | Clean API, React Email, big ecosystem | | **Best with a visual builder** | MailerSend | Drag-and-drop editor, SMS, verification | | **Cheapest raw sending** | Amazon SES | $0.10 per 1,000, build the rest yourself | | **Best for routing-heavy setups** | Mailgun | Mature API and inbound routes | | **Best for enterprise procurement** | SendGrid | Twilio contracts, subusers, mature compliance | | **Best pay-as-you-go** | ZeptoMail | Prepaid credits, cheapest above ~150k | | **Best open source / self-hosted** | Reloop | Apache 2.0, one-command install | --- ## The comparison table | | Postmark | Reloop | Resend | MailerSend | Mailgun | Amazon SES | SendGrid | ZeptoMail | |---|---|---|---|---|---|---|---|---| | **Free tier** | 100 / mo | 6,000 / mo (200 / day) | 3,000 / mo (100 / day) | 500 / mo | 100 / day, trial | $200 AWS credits | 60-day trial, 100 / day | 10,000 (one free credit) | | **~50k / mo** | ~$87 (Basic + overage) | **$10** | $20 | $35 | $35 | ~$5 | $19.95 | ~$12.50 | | **~100k / mo** | ~$177 (Basic + overage) | **$20** | $35 | $68 | $90 | ~$10 | $34.95 | ~$25 | | **Dedicated IP** | $50 / mo, 300k+ | Included on Growth ($20) | $30/mo add-on on Scale ($90+) | Professional add-on | Paid add-on | $24.95 / mo | Pro, from $89.95 | Paid add-on | | **Inbound** | Webhook (Pro and up) | Mailboxes + threads, API, MCP, IMAP | Webhook | Forward to webhook | Routes | Receipt rules | Inbound Parse | Not offered | | **Marketing** | Broadcast stream | Campaigns + automations | Broadcasts | Via MailerLite | Limited | No | Separate plans | Not allowed | | **Open source / self-host** | No | **Yes** | No | No | No | No | No | No | Sources: [postmarkapp.com/pricing](https://postmarkapp.com/pricing), [resend.com/pricing](https://resend.com/pricing), [mailersend.com/pricing](https://www.mailersend.com/pricing), [mailgun.com/pricing](https://www.mailgun.com/pricing/), [aws.amazon.com/ses/pricing](https://aws.amazon.com/ses/pricing/), [sendgrid.com/pricing](https://sendgrid.com/pricing/), [ZeptoMail pricing](https://www.zoho.com/zeptomail/pricing.html), [reloop.sh/pricing](/pricing). Postmark's 50k and 100k figures are Basic list price plus overage; Pro and Platform lower overage to $1.30 and $1.20, so use [Postmark's calculator](https://postmarkapp.com/pricing) for your exact volume. Mailgun's 100k figure is its Scale plan ($90 for 100,000). ZeptoMail's figures use the widely listed $2.50 per 10,000-email credit, which varies by region. SES is send-only, before data transfer. --- ## 1. Reloop: best overall Postmark alternative Reloop is open-source email infrastructure: a transactional API, SMTP relay, inbound mailboxes, contacts, campaigns, automations and webhooks in one product. Use it hosted (Reloop Cloud runs on Hetzner, a German hosting company, with EU data centers) or run the same code on your own server. **Pricing:** Free is 6,000 emails a month (200 a day). Pro is $10 for 50,000. Growth is $20 for 100,000 and includes a dedicated IP. Extra mail is $0.50 per 1,000. Or skip the plan and buy prepaid credits at $0.50 per 1,000, valid for 6 months. Self-hosting is free under Apache 2.0. **Strengths** - **About an eighth of Postmark's price at 50k**: $10 vs about $87 on Basic with overage, and $20 vs about $177 at 100k. - **A free tier you can run on**: 6,000 a month instead of 100. - **Inbound as real mailboxes on every plan.** Mail is stored, threaded, spam-scored with Rspamd, and readable over the API, the [MCP server](/docs/integrations/ai-tools/mcp-server) or IMAP. Hosted plans include 3, 5 or 10 inboxes on Free, Pro and Growth. - **A dedicated IP at $20**, without sending 300,000 emails a month. - Transactional mail, campaigns and event-triggered automations share one API key and one suppression list. - Errors come back with `message`, `why` and `fix`. **Weaknesses** - Younger than Postmark, with a shorter track record and fewer community answers. - No separate message streams like Postmark's. Reloop isolates traffic with per-domain throttling and pauses on its own MTA (KumoMTA) instead. - Open and click tracking are on for new domains; switch them off per domain if you want Postmark-style plain sends. **Best for:** teams sending more than 10,000 emails a month who want Postmark's job done for less, plus inbound and campaigns in the same place. Full comparison: [Reloop vs Postmark](/blog/reloop-vs-postmark). --- ## 2. Resend: closest developer experience Resend made the clean, Stripe-style email API the norm, and its React Email project made JSX templates mainstream. If what you like about Postmark is a simple API and good docs, Resend feels familiar. **Pricing:** Free is 3,000 a month (100 a day). Pro is $20 for 50,000 and $35 for 100,000. Overage is $0.90 per 1,000. **Strengths:** excellent docs and onboarding, first-class React Email, a large ecosystem of examples, and broadcasts for simple marketing sends. **Weaknesses:** cheaper than Postmark at 50k but still double Reloop, and $35 at 100k vs $20. Hosted only. Inbound is a webhook per message, not a mailbox. A dedicated IP needs the $90 Scale plan plus a $30/mo add-on. **Best for:** small teams that want a polished hosted API and expect to stay under 50k emails a month. Full comparison: [Reloop vs Resend](/blog/reloop-vs-resend). --- ## 3. MailerSend: best with a visual builder MailerSend is a developer-first transactional API from the team behind MailerLite, with a stronger no-code side than Postmark: a drag-and-drop builder, SMS, email verification and split testing. **Pricing:** Free is 500 emails a month. Hobby is $7 for 5,000. Starter is $35 for 50,000 and $68 for 100,000, with overage at $1.30 per 1,000. Professional is $110 for 50k and $140 for 100k, and adds the dedicated IP add-on. **Strengths:** non-developers can edit emails, SMS and verification come from the same vendor, and DMARC and blocklist monitoring are included on Starter and up. **Weaknesses:** inbound mail is parsed and forwarded, not stored, and each forward counts against your quota. Hosted only. **Best for:** teams where marketers or support staff edit transactional templates. Full comparison: [Reloop vs MailerSend](/blog/reloop-vs-mailersend). --- ## 4. Mailgun: best for routing-heavy setups Mailgun is one of the original developer email APIs, with mature sending, email validation and **inbound routes** that match incoming mail by pattern and forward it. **Pricing:** a trial at 100 emails a day. Basic is $15 for 10,000; Foundation is $35 for 50,000. Overage starts at $1.30 per 1,000 ($1.80 on Basic). Dedicated IPs are a paid add-on. **Strengths:** long track record, flexible inbound routing, built-in email validation (priced as an add-on), Handlebars templates. **Weaknesses:** at 100k you're around $100 with overage. Marketing is a separate Sinch product. Hosted only. **Best for:** teams that want a mature API with flexible inbound routing rules. Full comparison: [Reloop vs Mailgun](/blog/reloop-vs-mailgun). --- ## 5. Amazon SES: cheapest raw sending SES is the lowest list price in email: $0.10 per 1,000. It's a sending pipe, not a product. Everything around it is yours to build. **Pricing:** $0.10 per 1,000 emails plus $0.12 per GB of outbound data. New AWS accounts get $200 in Free Tier credits for the first 6 months. **Strengths:** cheapest per email at any volume, deep AWS integration (IAM, SNS, Lambda, EventBridge). **Weaknesses:** you build bounce and complaint handling, suppression, logs, template editing and dashboards yourself. Inbound goes through receipt rules to S3, SNS or Lambda. You also need to leave the SES sandbox before you can email real users. **Best for:** AWS-native teams with engineers to own the glue, or senders at millions of emails a month. Full comparison: [Reloop vs Amazon SES](/blog/reloop-vs-aws-ses). --- ## 6. SendGrid: best for enterprise procurement SendGrid (Twilio) is the incumbent: a mature enterprise program, subusers, IP pools and full Handlebars templating. **Pricing:** a 60-day trial at 100 emails a day. Essentials is $19.95 for 50,000 and $34.95 for 100,000. Dedicated IPs, subusers and SSO start on Pro from $89.95. **Strengths:** procurement-friendly, mature compliance program, Handlebars logic (`#if`, `#each`) in templates. **Weaknesses:** no permanent free plan, marketing is on separate plans, inbound is the Inbound Parse webhook. Hosted only. **Best for:** larger companies whose procurement prefers an established vendor. Full comparison: [Reloop vs SendGrid](/blog/reloop-vs-sendgrid). --- ## 7. ZeptoMail: best pay-as-you-go ZeptoMail is Zoho's transactional-only service, now branded as part of Zoho CPaaS. You buy credits of 10,000 emails and spend them down. **Pricing:** the first credit is free. Credits are widely listed at $2.50 each, vary by region, and expire after 6 months. That's about $12.50 at 50k and $25 at 100k. **Strengths:** above roughly 150,000 emails a month it's cheaper per email than Reloop. No monthly fee if your volume is spiky. **Weaknesses:** transactional only; marketing mail isn't allowed. No inbound storage, no automations. Credits expire. **Best for:** steady high-volume transactional senders who want to pay per email. Full comparison: [Reloop vs ZeptoMail](/blog/reloop-vs-zeptomail). --- ## How to choose - **"Postmark is too expensive at our volume."** Reloop for the full platform at $10 / $20, ZeptoMail for pure per-email cost at high volume, SES if you'll build the tooling. - **"We like Postmark's API and docs."** Resend or Reloop; both are clean, modern APIs. - **"Marketers need to edit templates."** MailerSend. - **"We need to receive and reply to email."** Reloop, which stores inbound mail in threaded mailboxes on every plan. - **"We need a dedicated IP below 300k a month."** Reloop includes one on Growth at $20. - **"Legal wants source code or self-hosting."** Reloop is the only option here that's open source. If transactional reputation is the reason you chose Postmark, keep that discipline wherever you go: send transactional and marketing mail from different subdomains, and keep a single suppression list. Our [transactional email best practices](/blog/transactional-email-best-practices) cover the setup. --- ## Switching from Postmark 1. **Add your domain** in the new provider and publish its DKIM record. Merge the new SPF include into your existing record; never publish a second SPF record. 2. **Swap the client.** Postmark uses PascalCase fields (`From`, `HtmlBody`, `ReplyTo`); most alternatives use lowercase (`from`, `html`, `reply_to`). 3. **Move templates.** Postmark templates use Mustachio. On Reloop, change placeholders to triple braces: `{{{first_name}}}`. 4. **Export your suppressions** and import them, so you don't re-mail addresses that bounced or complained. 5. **Point webhooks** at a new handler. Reloop signs events with HMAC-SHA256 in the `Reloop-Signature` header. 6. **Ramp traffic** from 10% to 100% over a week or two, then remove Postmark's DNS records. The [Reloop vs Postmark](/blog/reloop-vs-postmark) post has the step-by-step version, and the [SendGrid migration guide](/blog/migrating-from-sendgrid) shows a traffic-split flag that works for any provider. If you're comparing more broadly, see our [Postmark alternative page](/alternatives/postmark) and [full feature comparison](/compare/postmark). --- ## FAQ Amazon SES has the lowest list price at $0.10 per 1,000, but it's a raw pipe. Among full platforms, Reloop is $10 for 50,000 and $20 for 100,000. Above roughly 150,000 a month, ZeptoMail's credits work out cheaper per email, for transactional mail only. Yes. Reloop is open source under Apache 2.0. You can use the hosted version or run it on your own server with a one-command installer. Not if your domain is set up properly. Inbox placement depends mostly on SPF, DKIM, DMARC, list hygiene and steady sending patterns. Ramp traffic over a week or two and watch bounce and complaint rates. Check your domain with the free [domain reputation checker](/tools/domain-reputation-checker) before and after. Reloop stores inbound mail in threaded mailboxes you can read and reply to over the API, MCP or IMAP, on every plan. Most others forward each message to a webhook, and Postmark itself needs Pro for inbound. Not under that name. The common pattern is to send transactional and marketing mail from separate subdomains so their reputations stay separate. Reloop also throttles per domain and pauses sending automatically when bounce or complaint rates spike.