# Custom SMTP Email Marketing

> Custom SMTP email marketing with Mailrith. Bring your own SMTP provider for newsletters, campaigns, sequences, automations, and reports.

- Human page: https://mailrith.com/features/custom-smtp-email-marketing
- Markdown page: https://mailrith.com/features/custom-smtp-email-marketing.md
- Page family: Features
- Category: Delivery Control
- Primary keyword: custom SMTP email marketing
- Related keywords: email marketing with own SMTP, bring your own SMTP email marketing, SMTP newsletter platform, use my SMTP for newsletters
- Last reviewed: 2026-05-26

## Direct Answer
Bring the SMTP provider you already trust and use Mailrith for campaigns, subscribers, forms, automations, and reports.

- Use Amazon SES, Postmark, SendGrid, Mailgun, Resend, Brevo, or custom SMTP.
- Keep delivery costs separate from marketing software.
- Change providers later without rebuilding your subscriber workflow.

## Most Email Tools Hide The Sender From You
Bundled platforms can be easy, but they also hide where the email is sent from and how delivery costs are built into the plan.

- **Costs Are Hard To Read:** Contact tiers and send limits can make it hard to know what list growth will cost later.
- **Provider Choice Is Limited:** If you already like a delivery provider, many marketing tools still force you into their sender.
- **Debugging Gets Slower:** When delivery is hidden, it is harder to check provider logs, limits, authentication, and sender settings.

## Why Mailrith Works Well With Your Own SMTP
Mailrith keeps the marketing workflow in one place while your SMTP provider stays responsible for sending.

- **Provider Freedom:** Connect guided providers or standard SMTP settings, then use that connection for campaigns and sequences.
- **Clear Responsibility:** Mailrith manages the list and workflow. Your provider manages delivery, limits, and provider billing.
- **Useful Marketing Tools:** Use subscribers, tags, custom fields, segments, forms, broadcasts, sequences, and automations around the sender.

## What You Can Build With Custom SMTP
This setup is best when you want a real email marketing app without giving up your chosen sender.

1. Add your provider host, port, username, password, and sender details.
2. Send a test email from Mailrith before using the connection.
3. Create the form or landing page that collects new subscribers.
4. Build a broadcast, sequence, or automation using that delivery connection.
5. Watch bounces, complaints, and unsubscribes so the list stays healthy.

## The Simple Cost Logic
You pay Mailrith for the marketing app and your SMTP provider for delivery. That keeps software cost and sending cost easier to understand.

## Estimated SMTP Sending Cost
Custom SMTP does not have one fixed price because the delivery provider is the service you connect. Use this table as a reminder to price the sender separately from Mailrith.

| Monthly Sends | Provider Cost | How To Read It |
| --- | --- | --- |
| 1,000 emails / month | Provider-dependent | Check the SMTP provider you plan to connect. |
| 10,000 emails / month | Provider-dependent | Some providers include this in an entry plan; others charge per 1,000 emails. |
| 50,000 emails / month | Provider-dependent | At this volume, compare included emails, overage rates, daily limits, and support. |
| 100,000 emails / month | Provider-dependent | At this volume, also check warmup, dedicated IP, deliverability, and provider approval rules. |

Source: [SMTP And Delivery Providers](https://mailrith.com/guides/smtp-and-delivery-providers). Provider-only estimate. It excludes Mailrith's subscription and anything your SMTP provider charges for add-ons, overages, support, dedicated IPs, or higher-volume plans.

## What To Be Honest About
- **You Need A Real Delivery Provider:** A personal mailbox SMTP account is usually not the right sender for newsletters or campaigns.
- **DNS Still Matters:** SPF, DKIM, DMARC, and sender-domain setup still affect whether your email is trusted.

## Who This Helps
- You already trust a provider such as Amazon SES, Postmark, SendGrid, Mailgun, Resend, Brevo, or another SMTP service.
- You want clearer ownership of sender domains, authentication, provider limits, and delivery costs.
- You need a hosted marketing app, not a self-hosted email system.

## When Another Tool May Fit Better
- You do not want to touch DNS, SMTP credentials, test sends, or provider dashboards.
- You want all sending and software usage rolled into one vendor and one bill.
- You expect the marketing app alone to guarantee inbox placement.

## What To Check Before Connecting SMTP
- **SMTP Settings:** Confirm the host, port, username, password or API key, encryption mode, and allowed sender address.
- **Domain Records:** Make sure SPF, DKIM, and DMARC are correct for the sender domain before sending real campaigns.
- **Provider Limits:** Check daily limits, hourly limits, sandbox rules, and any approval step your provider requires.
- **Event Feedback:** If your provider supports webhooks, connect bounces and complaints so Mailrith can help protect the list.

## Common Mistakes To Avoid With SMTP
- **Using A Personal Inbox SMTP:** A mailbox SMTP account is usually not built for newsletters or automation. Use a proper email delivery provider.
- **Sending From A New Domain Too Fast:** A new sender needs patience. Warm up with small, engaged sends instead of importing everyone on day one.
- **Forgetting Unsubscribe And Suppression Rules:** Your SMTP provider sends the message, but your marketing system still needs to respect unsubscribes and bad-address states.

## How Mailrith Fits
Mailrith gives your SMTP provider a practical marketing layer: subscribers, fields, tags, segments, forms, landing pages, broadcasts, sequences, automations, and reporting.

- Use guided providers when available or enter standard custom SMTP settings.
- Send test emails before using a connection for real campaigns.
- Keep provider billing, reputation, and limits separate from Mailrith software pricing.
- Use the same subscriber tools no matter which SMTP provider you connect.

## Decision Table
| Criteria | Mailrith | Other Common Approach |
| --- | --- | --- |
| Setup | You connect the SMTP provider and test it inside Mailrith. | Bundled platforms may need less setup because they own the sending infrastructure. |
| Control | Your team can see and manage provider choice, sender records, limits, and delivery costs. | Managed platforms may hide these details, which can be convenient until you need to debug them. |
| Portability | Changing provider is a delivery-connection decision, not a full marketing stack rebuild. | A fully bundled platform can make the sending layer harder to separate from the app. |
| Best Fit | Teams that want a hosted app with provider choice and cost visibility. | Teams that want zero sender setup may prefer a tool that bundles delivery. |

## How To Send Marketing Email Through Custom SMTP
1. Choose an SMTP provider that is meant for bulk or application email, not a personal mailbox.
2. Authenticate the sender domain and check provider limits before planning the first send.
3. Create a Mailrith email delivery connection with the provider settings.
4. Send a test email and fix any authentication, credential, or provider error before launch.
5. Use a smaller engaged segment first, then increase volume as results stay clean.

## Plain Facts You Can Rely On
- Mailrith supports custom SMTP settings and several guided delivery providers.
- Mailrith does not sell inbox placement guarantees.
- The SMTP provider controls sending infrastructure, quotas, provider logs, and provider billing.
- Mailrith controls the marketing workflow: subscribers, forms, broadcasts, sequences, automations, and reports.
- Good sending still depends on permission, authentication, content, pace, and list quality.

## Related Resources
- [Set Up Custom SMTP](https://mailrith.com/docs/setup-custom-smtp): Connect any provider that gives you standard SMTP settings.
- [Email Delivery Connections](https://mailrith.com/docs/email-delivery-connections): Create and test provider connections in Mailrith.
- [Sender Domains And Authentication](https://mailrith.com/guides/sender-domains-and-authentication): Prepare the domain before you send to real subscribers.
- [SMTP TLS Checker](https://mailrith.com/free-tools/smtp-tls-checker): Check whether an SMTP server supports secure transport.

## Questions People Usually Ask
### Can I Use Any SMTP Provider?

You can use providers that give standard SMTP settings and allow your use case. Some mailbox providers block or limit newsletter-style sending, so check their rules first.
### Is Custom SMTP Better Than A Bundled Email Tool?

It depends. Custom SMTP is better when you want control and cost visibility. A bundled tool may be better when you want the least setup possible.
### Can I Change SMTP Providers Later?

Yes. You can create or update delivery connections, then move sending to the provider that fits your needs.