Gmail to Gmail. Outlook to Outlook.
SendKit works out which provider each lead is on and sends from a mailbox on the same one. Gmail to Gmail, Outlook to Outlook, across Yahoo, Apple, and custom domains too.




Lambda Group
Mailboxes
Email | Status | Sent / Limit | Tags | Warmup Stats | Warmup | Sending | |
|---|---|---|---|---|---|---|---|
Alex Johnson | Active | 14/50 | Cold Outreach | Day 2122/2591% health | |||
Sarah Mitchell | Active | 31/50 | Cold Outreach | Day 1819/2587% health | |||
Outreach Pool | Active | 5/25 | Warming Pool | Day 78/2574% health | |||
Alex (Domain B) | Active | 28/50 | Cold Outreach | Day 1617/2583% health | |||
Sales Team | Active | 42/50 | Agency | Day 2424/2594% health | |||
Jenny Lee | Active | 19/50 | Cold Outreach | Day 1213/2579% health | |||
Tom Rivera | Active | 37/50 | Agency | Day 2021/2588% health | |||
Priya Sharma | Active | 8/25 | Warming Pool | Day 56/2568% health |
Right provider, right mailbox, always
Gmail, Outlook, Yahoo, Apple, and custom domains are each identified and routed automatically.
In auto mode, SendKit routes each email through a sender on the same provider as the recipient.
Off, fully automatic, or your own routing rules. Pick the level of control that fits your workflow.
Same-provider delivery improves the chances of landing in primary instead of spam or promotions.
Auto-match providers to mailboxes
SendKit identifies whether your lead is on Gmail, Outlook, Yahoo, Apple, or a custom provider before the send goes out.
If the lead is on Gmail, SendKit sends from one of your Gmail mailboxes. Outlook leads get Outlook senders. This improves inbox placement.
Leave it off, let SendKit handle it automatically, or write your own routing rules when you need finer control.
Gmail to Gmail delivery tends to land in primary more often. ESP matching routes your Gmail leads through Gmail senders automatically.
When you have both Gmail and Outlook mailboxes, ESP matching assigns each lead to the best sender. You don't have to think about it.
For advanced setups, define custom rules with priority. Route specific domains through specific mailboxes with full control.
Provider-aware sending, not random relay
Automatic ESP detection and matching
SendKit identifies each recipient's provider and routes through a matching mailbox. Gmail leads get Gmail senders. Outlook leads get Outlook senders. Leave it off, let it run automatically, or write your own rules.
Provider detection across every major host
Detection reads the receiving domain's public mail records, so it works on custom domains sitting on Google Workspace or Microsoft 365, not just obvious gmail.com addresses. Matching runs automatically, or you can define your own rules.
Got questions? We've got answers.
ESP matching works out which provider each recipient is on, then sends through one of your mailboxes on that same provider. Gmail to Gmail, Outlook to Outlook.
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