Custom SMTP Email Marketing
Use the email delivery service you already trust, and use Mailrith to manage campaigns, subscribers, forms, automations, and reports.
- Connect Amazon SES, Postmark, SendGrid, Mailgun, Resend, Brevo, or Custom SMTP.
- Keep email delivery costs separate from your Mailrith plan.
- Change email delivery services later without rebuilding your subscriber workflow.
The Problem
Most Email Tools Hide The Sender From You
Combined platforms can be easy to start with, but they can hide which service sends your email and how delivery costs are included in the plan.
Costs Are Hard To Read
Contact tiers and send limits can make future list growth costs hard to predict.
Service Choice Is Limited
If you already prefer an email delivery service, many marketing tools still require you to use their sending setup.
Delivery Problems Are Harder To Understand
When a platform hides delivery, it is harder to review delivery events, sending limits, domain setup, and sender settings.
Why Mailrith
Why Mailrith Works Well With Your Delivery Service
Mailrith keeps your marketing work in one place while your email delivery service sends each message.
Service Choice
Connect a supported service or choose Custom SMTP, then use that connection for campaigns and sequences.
Clear Responsibility
Mailrith manages subscribers and follow-up. Your email delivery service manages sending, its limits, and its charges.
Useful Marketing Tools
Use subscribers, tags, custom fields, segments, forms, broadcasts, sequences, and automations with your chosen email delivery service.
The Simple Cost Logic
You pay for your Mailrith plan and your email delivery service separately. This keeps the email marketing cost and sending cost clear.
Sending Cost
Estimated SMTP Sending Cost
Custom SMTP does not have one fixed price because the email delivery service is the service you connect. Use this table to estimate sending costs separately from Mailrith.
| Monthly Sends | Delivery Service Cost | How To Read It |
|---|---|---|
| 1,000 emails / month | Service-dependent | Check the pricing for the email delivery service you plan to connect. |
| 10,000 emails / month | Service-dependent | Some services include this sending volume in an entry plan; others charge per 1,000 emails. |
| 50,000 emails / month | Service-dependent | At this volume, compare included emails, overage rates, daily limits, and support options. |
| 100,000 emails / month | Service-dependent | At this volume, also check gradual sending requirements, dedicated IP options, delivery features, and service approval rules. |
Source: Custom SMTP And Email Delivery Services . Email-delivery-service estimate only. It excludes Mailrith's subscription and any charges from the service for add-ons, overages, support, dedicated IPs, or higher-volume plans.
Example Setup
What You Can Build With Custom SMTP
This setup works well when you need an email marketing app and want to keep your chosen email delivery service.
- 1
Add the Custom SMTP connection details and sender details supplied by your email delivery service.
- 2
Send a test email from Mailrith before you use the connection for campaigns or sequences.
- 3
Create the form or landing page that collects new subscribers.
- 4
Build a broadcast, sequence, or automation with that delivery connection.
- 5
Monitor bounces, complaints, and unsubscribes to help keep the list healthy.
Best Fit
- You already use an email delivery service such as Amazon SES, Postmark, SendGrid, Mailgun, Resend, Brevo, or another service that supplies Custom SMTP settings.
- You want to see sender domains, domain checks, service limits, and delivery costs clearly.
- You need a hosted marketing app instead of a self-hosted email system.
When Another Tool May Fit Better
- You do not want to manage domain records, Custom SMTP connection details, test sends, or another service account.
- You want email marketing and sending combined under one company and one bill.
- You expect the marketing app by itself to guarantee inbox placement.
Before You Start
What To Check Before Connecting SMTP
Use this checklist before you start to confirm that your list, sender setup, team responsibilities, and first campaign are ready.
SMTP Settings
Confirm the host, port, username, password or API key, encryption mode, and allowed sender address.
Domain Records
Before you send real campaigns, confirm that SPF, DKIM, and DMARC pass for the sender domain.
Service Limits
Check the service's daily limits, hourly limits, test-account rules, and any required approval step before you plan a send.
Event Feedback
If your email delivery service can send bounce and complaint updates to Mailrith, connect those updates so Mailrith can help protect the list.
Tradeoffs
Compare What Changes With Each Setup
No email tool is right for every team. Review the main tradeoffs before you test a tool.
Questions To Consider
What To Be Honest About
Review these points before you start building, so you know which limits and setup choices matter.
You Need A Real Email Delivery Service
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 inbox providers trust your email.
Quick Facts
What To Know Before You Start
Use these practical points when you compare tools or share the decision with someone else.
- Mailrith supports Custom SMTP settings and several email delivery services with step-by-step connection guides.
- Mailrith does not sell inbox placement guarantees.
- The email delivery service controls sending, limits, delivery events, and its own charges.
- Mailrith controls the marketing workflow: subscribers, forms, broadcasts, sequences, automations, and reports.
- Good sending still depends on permission, authentication, content, sending pace, and list quality.
Related Resources
Use these pages to move from the decision to setup, sending, and list maintenance.
Set Up Custom SMTP
Connect an email delivery service that gives you the required Custom SMTP settings.
Email Delivery Connections
Create and test email delivery service connections in Mailrith.
Sender Domains And Authentication
Prepare the sender domain before you send to real subscribers.
SMTP TLS Checker
Check whether an SMTP server supports secure transport.
Questions People Usually Ask
Can I Use Any Email Delivery Service With Custom SMTP?
You can use an email delivery service that gives you the Custom SMTP settings Mailrith needs and allows your type of email. Personal mailbox services often block or limit newsletter sending, so check the service rules before you connect.
Is Custom SMTP Better Than A Bundled Email Tool?
It depends on your needs. Custom SMTP is useful when you want to choose the email delivery service and see its costs. A combined tool may be better when you want the least setup possible.
Can I Change Email Delivery Services Later?
Yes. You can create or update delivery connections, then move future emails to the service that fits your needs.