Migration center

Move email providers without guessing

Practical migration guides for transactional sending, SMTP relay, inbound webhooks, templates, suppressions, domain authentication, and traffic cutover.

Open converter Setup checklist

Code conversion

Translate common send calls from SendGrid, Mailgun, Postmark, Resend, and SES into Postscale JSON.

Inbound route mapping

Replace inbound parse, routes, receipt rules, and receiving webhooks with aliases, rules, and signed webhooks.

Deliverability carry-over

Move suppressions first, keep DKIM selectors live, ramp traffic gradually, and watch delivery by ISP.

SendGrid

API, SMTP, inbound, webhooks

Move from SendGrid to Postscale with endpoint mapping, inbound parse replacement, webhook conversion, suppression import, and a zero-downtime DNS cutover plan.

Replace SendGrid Mail Send with POST /v1/send.

Map categories and custom_args to Postscale tags and metadata.

Replace Inbound Parse with structured inbound email webhooks.

Mailgun

API, SMTP, inbound, webhooks

Move Mailgun sending, routes, webhooks, templates, and suppressions to Postscale with EU-hosted primary service data and a practical migration checklist.

Convert Messages API calls from multipart form data to JSON.

Replace Routes with aliases, inbound rules, and webhooks.

Move bounces, complaints, and unsubscribes before production traffic.

Postmark

API, SMTP, inbound, webhooks

Move Postmark sending, message streams, templates, suppressions, and inbound webhooks to Postscale with field mapping and a production cutover checklist.

Convert PascalCase API fields into Postscale snake_case JSON.

Map Message Streams to tags, metadata, and webhook subscriptions.

Keep server API token changes isolated behind one mail adapter.

Resend

API, SMTP, inbound, webhooks

Move Resend sends, hosted templates, receiving webhooks, tags, and domains to Postscale with SMTP support, inbound rules, and EU-hosted primary service data.

Convert Resend emails.send payloads to POST /v1/send.

Use SMTP relay for systems that cannot call a REST API.

Move receiving flows to inbound aliases and signed webhooks.

Amazon SES

API, SMTP, inbound, webhooks

Move Amazon SES sending, SMTP credentials, receipt-rule inbound processing, suppressions, and deliverability monitoring to Postscale with a simpler email API.

Replace SendEmail or SendRawEmail with POST /v1/send.

Swap SES SMTP credentials for Postscale SMTP relay credentials.

Replace S3 plus Lambda receipt rules with inbound webhooks.

The migration path Postscale optimizes for

Keep your old provider live, publish Postscale DNS in parallel, convert one mail adapter, import suppressions, then ramp by traffic percentage while monitoring delivery by ISP.