The SendGrid Alternative with Zero Per-Email Markup & Smart Failover
Stop paying high SaaS markups for basic SMTP delivery. CentricSell Mail gives you an enterprise API and SMTP relay in front of Amazon SES, SendGrid, Mailgun, and your own dedicated servers.
No Per-Email Markups
SendGrid charges steep rate increases as you scale from 50k to 5M emails. With CentricSell Mail, you pay flat subscription pricing for the platform and pay raw infrastructure rates ($0.10/1,000 via SES).
Smart Multi-ESP Failover
When SendGrid experiences an outage or temporary 421/550 throttling, your emails are lost or delayed. CentricSell Mail automatically fails over to Amazon SES or Mailgun in real time.
True PostgreSQL Row-Level Security
Instead of application-layer filtering where a single software bug can leak tenant data, every CentricSell Mail tenant is isolated by PostgreSQL Row-Level Security (RLS) enforced at the database level.
Bring Your Own VPS & Dedicated IPs
SendGrid charges $89.95/month for a single dedicated IP. With CentricSell Mail, register your own $5/mo VPS (Hetzner, DigitalOcean) and we deploy and configure a verified mail server over SSH.
Side-by-Side Comparison
How CentricSell Mail compares to Twilio SendGrid on core architectural guarantees.
| Feature | Twilio SendGrid | CentricSell Mail |
|---|---|---|
| Email Sending Volume | Charges per email sent with steep tier jumps and overages | Unlimited emails on every plan (only restricted by unique contacts) |
| Pricing Model | Steep per-email tiers + expensive overage fees | Flat monthly subscription + zero per-email fees |
| Multi-Provider Failover | None (Single vendor lock-in) | Automatic fallback across SES, SendGrid & Mailgun |
| Bring Your Own Server / IP | Not supported ($89.95/mo per IP addon) | Supported (Deploy mail server over SSH on any VPS) |
| Data Isolation Guarantee | Application-level software filters | PostgreSQL Row-Level Security (FORCE RLS) |
| Automated Pre-Flight DNS Verification | Recommended only (mail can be sent unverified) | Hard-blocked at API until SPF, DKIM & DMARC verify |
| SMTP Relay & REST API | Yes (Port 587 / REST API) | Yes (Port 587/465 & REST API) |
Cost & Savings Breakdown
Estimated monthly costs based on published 2026 provider pricing tiers.
| Monthly Volume | Twilio SendGrid | CentricSell Mail | Your Annual Savings |
|---|---|---|---|
| 100,000 emails / mo | $89.95 / mo | $29 / mo (CentricSell flat plan) | Save $731 / yr |
| 500,000 emails / mo | $449 / mo | $79 / mo (CentricSell flat plan) | Save $4,440 / yr |
| 1,000,000 emails / mo | $749 / mo | $79 / mo (CentricSell flat plan) | Save $8,040 / yr |
| 2,500,000 emails / mo | $1,550 / mo | $79 / mo (CentricSell flat plan) | Save $17,652 / yr |
Frequently Asked Questions
Can I migrate from SendGrid without changing all my application code?
Yes. CentricSell Mail provides a drop-in ESMTP relay on ports 587 and 465. Simply update your SMTP host, port, username, and API key password in your current application (WordPress, Nodemailer, Python smtplib, Laravel) and sends will route through CentricSell Mail immediately.
What if I already have a SendGrid account?
You can connect your existing SendGrid API key directly into CentricSell Mail as a backup provider in your failover priority chain. That way, your primary high-volume traffic routes through low-cost SES, but automatically falls back to your SendGrid account if SES ever hits rate limits.
Ready to scale your transactional & bulk email?
Get started with CentricSell Mail in minutes. Bring your existing AWS SES, SendGrid, or Mailgun credentials, or deploy onto your own dedicated VPS with verified SPF, DKIM, and rDNS.