AWS SES vs Nylas: When to Use Each

Command references used in this guide: nylas email send, nylas email list, and nylas email search.

What is the difference between Amazon SES and Nylas?

Amazon SES (Simple Email Service) is a send-first email platform: your application pushes outbound mail from a domain you verify, and AWS handles delivery, SPF/DKIM signing, and bounce tracking. Nylas is a contextual email API: it connects to a user's existing mailbox over OAuth and reads, searches, and sends from their address. SES sends from noreply@yourapp.com; Nylas sends from user@theircompany.com.

SES is priced for scale. According to the SES pricing page, outbound costs $0.10 per 1,000 emails, with no monthly minimum — among the lowest rates of any provider. Nylas bills per connected account rather than per message, because its value is inbox access, not send volume. The two price on entirely different axes.

How do Amazon SES and Nylas compare feature by feature?

The table compares both across ten dimensions. SES dominates outbound cost and AWS integration; Nylas dominates inbox access, calendar, and provider coverage. The only shared capability is sending — and even there, SES sends from your domain while Nylas sends from the user's.

When should you use Amazon SES?

Use SES when your application sends high volumes of mail from domains you control and cost matters. Password resets, receipts, shipping alerts, and marketing blasts all fit, and at $0.10 per 1,000 messages, SES is the cheapest at-scale option. If your stack already runs on AWS, SES integrates natively with SNS for bounce notifications and inbound receiving rules to S3 or Lambda.

Budget for the sandbox first. Every new SES account starts restricted: you can send only 200 messages per 24 hours, only to verified addresses, until you request production access — a manual review AWS documents in its production access guide. Plan that approval into your launch timeline; it isn't instant. SES also won't read a Gmail inbox or sync a user's calendar — it has no concept of a connected user account.

# Amazon SES — send via the AWS CLI (from a verified domain)
aws ses send-email \
  --from noreply@yourdomain.com \
  --destination ToAddresses=user@example.com \
  --message 'Subject={Data="Your reset code: 519302"},Body={Text={Data="Code expires in 10 minutes."}}'

When should you use Nylas?

Use Nylas when your application needs to work inside a user's real mailbox. A CRM that logs the email thread with a customer, an AI agent that triages a support inbox, or a scheduler that sends invites from the rep's own address all need contextual access SES can't provide. The user authenticates once over OAuth, and your app reads and sends on their behalf across Gmail, Outlook, Exchange, Yahoo, iCloud, and IMAP.

The CLI makes that testable immediately. After nylas auth login, you can read the inbox, search by sender, and send from the connected account in about two minutes, with --json output for piping into scripts or AI workflows. There's no domain to verify and no sandbox to escape, because Nylas sends through the user's own provider rather than its own relay.

# Nylas — read and send from the user's own mailbox
nylas auth login --provider google
nylas email search "from:customer@acme.com" --json --limit 20
nylas email send --to customer@acme.com \
  --subject "Re: your order" \
  --body "Following up from my own address, not a noreply."

Can you use Amazon SES and Nylas together?

Yes, and the split is clean. Send system-generated, high-volume mail from your domain through SES — password resets, receipts, digests — where the $0.10-per-1,000 rate keeps costs flat at millions of messages. Use Nylas for anything that reads or sends from a user's real inbox: CRM sync, agent triage, personal follow-ups. Each bills on a different axis, so the combined cost stays predictable.

A practical rule: if the From line says noreply@yourapp.com, that's SES. If it says user@theircompany.com, that's Nylas. An app that only sends notifications doesn't need Nylas; an app that only reads user inboxes doesn't need SES. For where Mailgun, Resend, and Postmark fit on the sending side, see the email API comparison.

Next steps

• SendGrid vs Nylas — the other major transactional sender compared
• Best email API for developers — SES, SendGrid, Mailgun, Resend, and Postmark side by side
• Email API pricing models — per-message vs per-account billing at scale
• SPF, DKIM, and DMARC explained — the records SES makes you verify
• Full command reference — every flag and subcommand documented