Your app signs in over SMTPThe app opens a TLS connection, announces itself and authenticates with a scoped key. Nothing is accepted until the key is verified.
SPFSending IP is authorised
PASS
DKIMSignature is valid
PASS
DMARCPolicy aligned
PASS
All three aligned with your From domain
Aligned
Signed
Security checks run firstSPF proves the IP may send, DKIM proves the message was not altered, and DMARC checks both line up with your From domain.
Your app
Gmail, Outlook
QueuePriority first
IP poolWarm IPs
ProviderPaced send
Accepted by the receiving server
Paced per provider
Warm IP
Queued, paced, routedMessages enter a priority queue, pick a warm IP from the right pool, and are paced to each mailbox provider's limits.
Inbox
Primary
Promotions
Updates
1 new
Acme Team
Welcome aboard
now
Billing
Your receipt is ready
2h
Team updates
Weekly summary
1d
Support
We have your request
2d
Primary tab
Not spam
It lands in the inboxWith authentication and a healthy reputation behind it, the message arrives in the primary tab, not in spam.
Mail
A
Welcome aboardFrom Acme Team
Hi Priya, your account is ready.
Verify your email to get started.
Reply here if you need help.
Read
Important
Opened
Starred
The customer reads itThe recipient opens the email and stars it as important. Those positive signals feed back into your sender reputation.
MigoSMTP copilot
AI
Why did Gmail defer some mail today?
get_events(provider=gmail) → [n] deferrals
read_headers(msg_a41b) → 421 rate limit
Gmail throttled one IP after a burst.
Pacing is lowered; it should clear shortly.
Event log
Provider rules
Plain-language answers
Cites its sources
Ask your sending data anythingThe copilot reads your events and logs through scoped tools, then explains what happened in plain language. It cites the records behind every answer so you can verify it.
Two independent 2026 studies show DMARC records are common while enforcement lags. We compare their numbers, explain why domains stall at p=none and set out a 90-day plan to move to reject.
Authentication went from best practice to the price of entry in under three years. This analysis traces the Gmail, Yahoo and Microsoft timeline, compares their requirements and looks at where the rules are heading.
Google brought Gemini to Gmail in January 2026. This analysis separates what was announced from what is guesswork, uses Litmus and Radicati data to size the stakes, and lays out three scenarios for senders through 2028.