Suppressions first
Unsubscribes, bounces and complaints are written before the first contact. The importer enforces the order, not a setting.
Before any contactMigration Center
Switch providers without losing a single unsubscribe.
The Migration Center reads your old account or your exported files, brings people over in a safe order, and gives you a plan to move your sending one week at a time. Your old provider keeps working until you switch it off.
SSendGridread-only keyRResendAPI keyMMailchimpAPI keyCSVAny providerfile upload
- Unsubscribes and bouncesfirst
- Contacts and fieldsthen
- Lists and segmentslast
How it works
Four screens, from old account to Notix
Click through a migration from SendGrid. The real one lives under Audience in the console.
Connect, review, import, move
Pick your provider and paste a key, or upload your files. Notix shows what it found before anything is written, including any rows it refused and why. Then you import and follow a week-by-week plan to move your sending.
- Each list comes over as a contact book with its fields
- Skip any list you do not want
- Mailchimp's cleaned addresses arrive as hard bounces
Migrate to Notix
From SendGridSendGrid API key (read access only)SG.••••••••••••••••••••Qx4
The key is kept sealed for one hour at most and deleted when the run ends. A SendGrid key that could change your account is refused before it is used.
Read my accountSafety
Unsubscribes always come first
Someone who opted out at your old provider must never get mail from Notix, even if an import stops halfway.
Your key, briefly
A pasted key is held sealed for at most an hour and deleted when the import starts or ends. Notix only reads with it and never sends with it.
At most 1 hourA second pair of eyes
The first campaign or automation to imported contacts is reviewed before it goes out.
First campaignNo code change
Keep your Resend or SendGrid code while you migrate
Notix accepts their send request as it is and answers in the same shape.
Change a URL and a key
Point your existing send call at the Notix compat URL and send your Notix API key as the bearer token. Your code keeps working while you test Notix with real traffic.
The compat URLs are a bridge, not something to build on. New code should use the Notix email API.
Compat URLs
# Keep your request. Change the URL. Use your Notix key.
- https://api.sendgrid.com/v3/mail/send
+ https://app.usenotix.dev/api/compat/sendgrid/v3/mail/send
- https://api.resend.com/emails
+ https://app.usenotix.dev/api/compat/resend/emails
The same request, the same answer
A Resend send gets Resend's answer back. A SendGrid send gets a 202 with the message id in X-Message-Id, as SendGrid gives it.
Webhooks can also arrive in your old provider's format for 30 days, beside the Notix event and signed with your Notix secret, so your handler keeps working too.
A Resend-shaped send to Notix
curl -X POST https://app.usenotix.dev/api/compat/resend/emails \
-H "Authorization: Bearer $NOTIX_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"from": "Acme <hello@acme.com>",
"to": ["amara@example.com"],
"subject": "Welcome",
"html": "<p>Glad you are here.</p>"
}'
# 200 {"id": "..."}: the answer Resend would give.
Four weeks
Move your volume gradually
Your domain is new to inbox providers on Notix. A steady climb keeps you out of spam.
15%week one: receipts and codes
40%week two: your most engaged list
75%week three: most broadcasts
100%week four: switch the old one off
A small sender gets a two-step plan instead: there is no reputation to build slowly.
Guides
Migrating from a particular provider?
Read-only key
SendGrid
Notix reads your account with a read-only key you paste.
Migrate from SendGridAPI keyResend
Notix reads your account with a key you paste. Delete it after the migration.
Migrate from ResendAPI keyMailchimp
Notix reads your account with a key you paste. Delete it after the migration.
Migrate from MailchimpCSV uploadBrevo
Upload the contacts and unsubscribes you export.
Migrate from BrevoCSV uploadPostmark
Upload the contacts and unsubscribes you export.
Migrate from PostmarkCSV uploadMailgun
Upload the contacts and unsubscribes you export.
Migrate from MailgunCSV uploadCustomer.io
Upload the contacts and unsubscribes you export.
Migrate from Customer.ioSee every provider and the price comparison on the migration hub.
FAQ
Questions, answered
Which providers can Notix read directly?
SendGrid, Resend and Mailchimp. You paste a key from your old account and Notix reads it. Brevo, Postmark, Mailgun and any other provider migrate by the CSV files they already let you export.
What happens to the key I paste?
It is held sealed for at most an hour, and deleted when the import starts or ends. Notix only reads with it and never sends with it. SendGrid can report what a key may do, so a SendGrid key that could change your account is refused. Resend and Mailchimp keys cannot be checked and usually have full access, so make a separate key just for the migration and delete it when the migration is done.
What comes over?
Unsubscribes, bounces and complaints first, then contacts with their custom fields, then segments. Each list becomes a contact book. Templates come over from SendGrid only. Send history and analytics stay with your old provider.
Do I have to change my code on day one?
Not if you send through Resend or SendGrid. Notix accepts their send request at a compat URL and answers in the same shape, so you change a URL and a key. It is there to get you migrated: new code should use the Notix API.
Why is my first campaign reviewed?
After an import, the first campaign or automation to the imported contacts is held for a short review. An import is the one moment a mistake reaches thousands of people at once. Until the review is done, sends through the compat URL are refused with a clear error.
Do I have to switch everything at once?
No. Keep your old provider running. Notix suggests moving 15% of your volume in week one, then 40%, 75% and finally 100%, so mailbox providers see a sender that grows steadily.
More features
Works with the rest of Notix
Audience
Contact books, custom properties, segments and topics people can opt in and out of, all behind the same API key.
Explore AudienceTemplates
A block editor for email, 54 starter templates across 14 industries, and variables you fill in from the API or a broadcast.
Explore TemplatesDeliverability
SPF, DKIM and DMARC records ready to publish, one-click DNS with Domain Connect, and a domain that pauses itself before bounces hurt it.
Explore DeliverabilityStart your migration today.
Paste an API key or upload a file. Nothing is written until you have seen what we found.