Match the provider, improve the placement
Sendbox figures out each recipient's email provider through domain lookup and MX records, then sends through a mailbox on that same provider — Gmail recipients get a Gmail sender, Outlook recipients get an Outlook sender. Gmail, Outlook, Yahoo, Apple, and custom domains are all supported.
Lambda Group
Mailboxes
Email | Status | Sent / Limit | Tags | Warmup Stats | Warmup | Sending | |
|---|---|---|---|---|---|---|---|
alex@yourcompany.com Alex Johnson | Active | 14/50 | Cold Outreach | Day 2122/2591% health | |||
sarah@yourcompany.com Sarah Mitchell | Active | 31/50 | Cold Outreach | Day 1819/2587% health | |||
outreach@senddomain.io Outreach Pool | Active | 5/25 | Warming Pool | Day 78/2574% health | |||
alex@seconddomain.io Alex (Domain B) | Active | 28/50 | Cold Outreach | Day 1617/2583% health | |||
sales@cold-mailer.com Sales Team | Active | 42/50 | Agency | Day 2424/2594% health | |||
jenny@thirddomain.io Jenny Lee | Active | 19/50 | Cold Outreach | Day 1213/2579% health | |||
tom@outbound.agency Tom Rivera | Active | 37/50 | Agency | Day 2021/2588% health | |||
priya@yourcompany.com Priya Sharma | Active | 8/25 | Warming Pool | Day 56/2568% health |
The right mailbox for every provider, every time
Gmail, Outlook, Yahoo, Apple, and custom providers all get detected automatically through domain lookup and MX analysis.
In auto mode, every email routes through a sender on the same provider as the recipient.
Disabled, auto, or custom rules with priority — pick whatever level of control fits your workflow.
Same-provider delivery improves the odds of landing in primary instead of spam or promotions.
Providers and mailboxes matched automatically
Domain lookup combined with MX record analysis works out whether a lead sits on Gmail, Outlook, Yahoo, Apple, or something custom.
A Gmail lead gets sent from one of your Gmail mailboxes, an Outlook lead from an Outlook mailbox — improving the odds of landing in the inbox.
Three options: disabled (no matching at all), auto (Sendbox handles it), or custom rules with priority settings for finer control.
Gmail-to-Gmail delivery tends to land in primary more consistently. ESP matching routes your Gmail leads through Gmail senders without you having to think about it.
With both Gmail and Outlook mailboxes connected, ESP matching assigns each lead to the best-fit sender automatically.
For advanced setups, write custom rules with priority to route specific domains through specific mailboxes with full control.
Sending that knows the provider, not a blind relay
ESP detection and matching, handled automatically
Sendbox reads MX records to detect each recipient's provider and routes through a matching mailbox — Gmail leads get Gmail senders, Outlook leads get Outlook senders. Choose between disabled, auto, or custom rules with priority.
MX record detection across the major providers
Sendbox reads domain and MX records to identify Gmail, Outlook, Yahoo, Apple, and custom email providers. Matching runs automatically in auto mode, or you can define custom rules with your own priority settings.
Got questions? We've got answers.
It detects each recipient's email provider through domain lookup and MX records, then routes your email through a mailbox on that same provider — Gmail to Gmail, Outlook to Outlook.
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