Comms & email
Resend (transactional email)
1 min readUpdated September 12, 2026
Setup time
~15 min
Difficulty
moderate
Who bills
Resend
API key for sending transactional email through a domain you verify.
Any agent that emails customers, sends briefs, or delivers newsletters uses Resend so the sender domain and reputation belong to you.
One Resend (transactional email) powers 8 agents. Typical cost $0–$20/mo.
InboxIQRequired
Sends customer replies from your domain.
NewsletterProRequired
Delivers newsletters at scale.
WelcomeWagonRequired
Sends the onboarding email series.
WarrantyBotRequired
Customer notifications about warranty status.
InvoiceCollectorRequired
Sends dunning and reminder emails.
RetainerXRequired
Sends retainer renewal and check-in emails.
TalentTrackRequired
Applicant confirmation and status emails.
ShopOpsUnlocks a mode
Cart-recovery emails via the InboxIQ sender. Store ops work without it.
Building a stack? Try the stack builder or open the full matrix.
- 1Create a Resend account at resend.com.
- 2Add and verify your domain (DNS records take 5–30 min to propagate).
- 3Generate an API key with Full access for your domain.
- 4Paste it into Hi5Agents → Settings → Keys → Resend.
Resend has a free tier (3k/mo); paid starts at $20/mo for 50k emails.
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