SendGrid is a proven platform that has moved a lot of mail for a lot of companies. But your sender reputation lives in their infrastructure, your marketing plan bills per contact, and your logs sit behind their retention window. mailstein sends from a dedicated IP on your own servers, bills per send, and keeps every log where you can read it.
SendGrid is broad and battle-tested. The gap is architectural: who owns the IP, how you get billed, and where your data lives.
SendGrid's lower tiers send from shared IP pools where a stranger's spam run can drag down your inbox placement. mailstein gives you a dedicated IP with managed warm-up, so your reputation is yours to build and yours alone to answer for.
SendGrid's Marketing Campaigns bill by contact count, so a list of subscribers you email once a quarter costs the same as one you email daily. mailstein bills only for emails you actually send, transactional and broadcast on one meter.
SendGrid's activity feed lives in their console under their retention limits. mailstein runs the Postal MTA on your infrastructure, so message logs, bounces, and delivery events are stored where you control access and history.
An honest line-by-line. SendGrid earns its checkmarks where it deserves them.
| mailstein | SendGrid | |
|---|---|---|
| Sends from an IP you own | Yes | Shared pool by default |
| Dedicated IP with managed warm-up | Included | Paid add-on / higher tiers |
| Transactional + broadcast on one meter | Yes | Separate Marketing product |
| Billed per send, not per contact | Per send | Marketing bills per contact |
| Message logs stored on your servers | Yes | In their console |
| Automatic SPF / DKIM / DMARC | Automatic | Manual setup |
| REST API + SMTP relay | Both | Both |
| Templates, contacts, campaigns, webhooks | Yes | Yes |
| SDK / CLI / MCP for agents | Yes | SDKs only |
| Free tier without a card | 50/mo, 1 domain | Trial-based |
If you've integrated SendGrid, mailstein will feel familiar: a clean REST API and an SMTP relay for anything already speaking mail. The difference isn't the code you write, it's the IP the message leaves from and the server your logs land on.
Per-send pricing means growing your audience doesn't inflate your invoice until you actually mail them. Roughly $130 at 125K sends a month, roughly $520 at 700K.
Dedicated IP, managed warm-up, and built-in bounce and complaint suppression keep your sender reputation isolated from everyone else's sending behavior.
Keep the API ergonomics you're used to. Trade the shared pool and the per-contact bill for a dedicated IP, per-send pricing, and logs on your own servers. Start free, no card, 50 emails a month.
Start free →