Infrastructure partners
One sequencer. Any inbox.
Buy inboxes from a provider you trust, bring the Google, Microsoft, or SMTP inboxes you already have, or buy domains and inboxes right inside SuperSend.
Cold email inbox providers
Buy mailboxes built for outbound, then connect them to SuperSend.
InboxKit
Connects via API key, OAuth
Google Workspace, Microsoft 365, and Azure mailboxes for cold email, with automatic DNS setup and built-in warmup.
- Google mailboxes
- Outlook mailboxes
- Azure mailboxes
Mission Inbox
Connects via API key
Email infrastructure with isolated, dedicated servers and IPs, AI content scanning, and API or SMTP access.
- High-volume API sending
- Dedicated isolated sending per customer
- SMTP mailboxes
Mailreef
Connects via API key
Cold email mailboxes on dedicated servers and IPs, with one-click setup, automatic DNS, and pre-warmed domains.
- Private SMTP mailboxes
- Dedicated mail servers
- Dedicated IP addresses
Infraforge
Connects via API
Private cold email infrastructure with dedicated IPs, automated DNS, and pre-warmed domains.
- Dedicated IPs per mailbox
- Automated DNS (SPF, DKIM, DMARC)
- Pre-warmed domains and mailboxes
Maildoso
Connects via SMTP / Google Workspace
SMTP and Google Workspace mailboxes for cold email, with DNS set up for you in under 10 minutes.
- Mix SMTP and Google Workspace mailboxes
- SPF, DKIM, DMARC auto-configured
- API for automation
Mailscale
Connects via SMTP / IMAP
Cold email inboxes created in minutes on self-hosted infrastructure, with automated DNS.
- 50+ inboxes in 5 minutes
- Automated DNS (SPF, DKIM, DMARC)
- Owns its IP pools and SMTP servers
Hypertide
Connects via SMTP / IMAP
Google, Microsoft, and Azure inboxes set up in hours, on tenant-isolated infrastructure.
- Google, Microsoft, and Azure support
- Dedicated domains and IPs per order
- SPF, DKIM, DMARC pre-configured
Bring your own inboxes
Already have Google, Microsoft, or SMTP inboxes? Connect them as they are.
Gmail
Connects via OAuth
Connect your existing Gmail or Google Workspace inboxes and send from them as they are.
- Google Workspace accounts
- Sign in with Google
- Use your own domain
Outlook
Connects via OAuth
Connect your existing Outlook or Microsoft 365 inboxes and send from them as they are.
- Microsoft 365 accounts
- Sign in with Microsoft
- Use your own domain
Custom SMTP
Connects via SMTP / IMAP
Any mailbox with SMTP and IMAP details, from your host, a reseller, or anywhere else.
- Works with any SMTP provider
- Use credentials from any source
- No vendor lock-in
Email sending APIs
For opted-in contacts, newsletters, and transactional volume.
SendGrid
Connects via API key
Email API for newsletters and contacts who opted in.
- Opted-in contacts
- Newsletter sends
- API connected
Amazon SES
Connects via API
Pay-per-use email sending on AWS for high volume.
- Scales to large volumes
- Pay-per-use pricing
- Fits the AWS ecosystem
Mailgun
Connects via API
Email API with domain authentication, deliverability tools, and analytics.
- Developer-friendly API
- Domain verification and DKIM
- Webhooks and analytics
Azure Communication Services
Connects via API
Microsoft's cloud email service for sending from the Azure ecosystem.
- Azure ecosystem
- Email Communication Services
- Global delivery
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Rather skip the setup?
Buy domains and inboxes inside SuperSend. DNS is set up for you, so there is nothing to configure.