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A SendGrid alternative for app email, campaigns, and replies

Compare SendMailOS and SendGrid for API sending, SMTP, free access, delivery events, templates, and campaign workflows. Use a practical migration checklist.

Try SendMailOS free See the Free plan

SendMailOS vs SendGrid

API and SMTP

SendMailOS

HTTP email API, sending-only SMTP credentials, and signed webhooks.

SendGrid

Web API and SMTP options for application email.

Free access

SendMailOS

3,000 email credits per monthly allowance window on Free, subject to account limits.

SendGrid

The documented Email API trial allows 100 emails per day for 60 days, then requires a paid plan.

Templates and team workflow

SendMailOS

Visual templates and Template Studio MCP, plus campaigns and native reply conversations.

SendGrid

Compare the Email API and Marketing Campaigns product plans for the tools your team needs.

What a send response means

SendMailOS

A 202 response means accepted for processing. Follow status and delivery events.

SendGrid

Map your existing response codes and event handling before changing providers.

Plan details checked October 23, 2026. Different products count contacts and usage differently; review the linked sources and the allowances in your account.

Compare paid plans and sending costs

Unlimited emails with your own server, from €12/month

Starter includes 25,000 hosted emails per billing month, 10,000 active subscribers, and one connected sending server. Own-server sending has no monthly platform email quota and does not use hosted credits.

Starter subscription and your VPS costs apply. Warm-up, fair use, server capacity, subscriber limits and other plan limits apply.

Calculate your sending cost Choose a VPS

Twilio SendGrid: published entry plans

Email API Essentials starts at US$19.95/month. Pro starts at US$89.95/month. The free Email API trial allows 100 emails/day for 60 days. SendGrid offers managed email infrastructure, SMTP/API, and dedicated IP options on selected plans. A provider-managed dedicated IP is different from connecting a VPS you operate.

Check Twilio SendGrid’s official pricing

Checked October 24, 2026. Competitor prices are in USD; SendMailOS prices are in EUR. These are entry-plan examples, not equal-capacity quotes or a currency conversion. Billing terms, taxes, promotions, contact tiers, and selected extras may change the final price. SendMailOS own-server delivery still requires your paid plan, VPS costs, and sending safeguards.

All SendMailOS plans

Start free, or connect your own sending server from €12/month. Every paid plan also includes a monthly hosted sending allowance.

Free

Build and test your first campaigns.

€0 / month
Hosted emails
3,000
Active subscribers
2,000
Sending domains
1
Tracking pixels
1
Own servers
—

Hosted delivery uses your monthly email allowance.

Start free

Starter

For one brand ready to send regularly.

€12 / month
Hosted emails
25,000
Active subscribers
10,000
Sending domains
3
Tracking pixels
3
Own servers
1

Unlimited own-server emailsVPS costs, sending safeguards, and other plan limits apply.

Choose Starter

Growth

For teams managing more brands and workflows.

€39 / month
Hosted emails
100,000
Active subscribers
50,000
Sending domains
10
Tracking pixels
10
Own servers
3

Unlimited own-server emailsVPS costs, sending safeguards, and other plan limits apply.

Choose Growth

Pro

For larger audiences and more sending infrastructure.

€99 / month
Hosted emails
250,000
Active subscribers
250,000
Sending domains
50
Tracking pixels
50
Own servers
10

Unlimited own-server emailsVPS costs, sending safeguards, and other plan limits apply.

Choose Pro

Prices shown per month in EUR. A hosted email uses one send per recipient. Own-server delivery does not use hosted credits. Your VPS costs and other plan limits still apply.

See every plan limit

Which one fits your work?

Choose SendMailOS when…

Your developers and campaign team want to work with sending, editable content, and reply conversations in one organization.

SendGrid may still fit when…

Your production integration already relies on its particular API behavior, operational tooling, or plan features. Treat replacing those dependencies as engineering work and test them explicitly.

This is an integration change

Changing the hostname or SMTP password is not a complete migration. Your application also depends on error handling, retries, event formats, templates, and subscriber preferences. Verify each contract using a controlled test before moving production email.

SendMailOS supports idempotency keys for retrying the same API send request. Use a stable key for the same intended message and inspect the documented responses. Do not assume SendGrid SDK calls, template identifiers, or webhook payloads will work unchanged.

For SendMailOS SMTP, the published setup uses STARTTLS on port 2525 or implicit TLS on port 2465. Check that your application or hosting environment supports those settings. A sending-only SMTP password is different from the password used to log in to the dashboard.

SendMailOS api interface illustration
SendMailOS product illustration · Example data

Before you switch from SendGrid

  1. Map the sending contract

    Record sender domains, templates, headers, attachments, recipient fields, and expected error responses. Identify which messages are transactional and which are marketing.

  2. Verify authentication and a test send

    Create the new sending identity and credentials. Test API or SMTP from your own backend without exposing secrets in browser code.

  3. Connect and validate events

    Verify webhook signatures. Handle duplicate or retried events and check how your application records failures, bounces, and unsubscribes.

  4. Move a controlled share first

    Keep a rollback route. Confirm that receipts, password resets, and replies reach the right application records before moving the remaining traffic.

Questions before you choose

Can I use SendMailOS as an SMTP alternative to SendGrid?

SendMailOS offers SMTP sending. Configure the documented host, TLS port, and sending-only password, then test compatibility with your application.

Is the SendGrid free trial an ongoing free plan?

The current Email API documentation describes a 60-day trial with 100 emails per day. Check the current product plan before relying on ongoing free sending.

Does a successful API request guarantee inbox placement?

No. Request acceptance, delivery to a receiving server, and placement in a recipient’s inbox are different events. Follow delivery status and test your own sending setup.

Sources and comparison notes

Written by the SendMailOS team. We checked the linked product and plan documentation on October 23, 2026. This is our own comparison, not an independent product test. Features, limits, and prices can change; check the plan you will actually use.

Competitor names identify the products being compared. No affiliation or endorsement is implied.

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Try SendMailOS for yourself

3,000 emails each month. Up to 2,000 subscribed contacts. Check your workspace for current limits and paid plans.

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