The parts of email nobody explains until something bounces.
Each page takes one thing a sending domain or a sending team has to get right, shows the record, the threshold or the payload involved, and says what Notix does about it automatically and what is still yours to do.
Authentication
Set up SPF, DKIM and DMARC
The three DNS records a sending domain needs, what each one proves, and the one-click path when your DNS provider supports Domain Connect.
SPF records for transactional email
What an SPF record says, the include for a sending service, the ten-lookup limit and how to stay under it.
DKIM selectors and keys
How a DKIM signature is checked, what the selector in the DNS name is for, and why each sending service gets its own.
DMARC record examples
Records for p=none, quarantine and reject, what alignment means, and how to read the aggregate reports before tightening.
Deliverability
Email deliverability and sender reputation
What mailbox providers score, the complaint threshold that matters, warming a new domain, and the honest position on shared IPs.
Check an email's deliverability before you send it
What a pre-send deliverability check looks at, the verdict and score it returns, and the four findings that block a send.
Email bounce handling
Hard bounces against soft bounces, what happens to the address automatically, and the bounce webhook payload your code receives.
Email suppression lists
Why a suppression list exists, the three reasons an address lands on it, and why one list across transactional and marketing matters.
Why transactional emails go to spam
The seven causes, in the order to check them, and what Notix already handles versus what is still yours.
The List-Unsubscribe header
What one-click unsubscribe is, what Gmail and Yahoo require of bulk senders, and where Notix sets the headers for you.
Email verification before you send
What a verification check can and cannot tell you about an address, and how Notix's pre-send check and OTP API fit together.
Sending
Batch and scheduled sends
Up to 100 messages in one call, a send scheduled for later, and what each returns and costs.
Idempotency keys for email
Why a retried request must not send twice, how the Idempotency-Key header works, and how to choose a key.
Verify an email webhook signature
HMAC-SHA256 over the timestamp and raw body, a five-minute tolerance, replay protection, and the check in four languages.
How email open and click tracking work
The pixel, the rewritten link, what Apple Mail Privacy Protection does to opens, and which numbers to trust.
Choosing a provider
Send your first email in five minutes.
Verify a domain, copy an API key, make one call. The free plan does not ask for a card.