Instant address
Allocate a random or custom local-part inbox on mailby.app in one click — no signup for Quick Free.
Product
Everything you need to catch a code, finish a signup, or test email flows — with controls you can trust.
Allocate a random or custom local-part inbox on mailby.app in one click — no signup for Quick Free.
Messages stream in over SSE with a poll fallback so OTPs show up without babysitting refresh.
Codes and links are pulled into one-click copy actions so you finish verification faster.
Allowlisted sanitization and a sandboxed preview. Remote content stays blocked by default.
Extend the receive window, clear the mailbox, or hard-delete — access ends immediately on delete.
Reopen an inbox on another device with a secret that never goes in query strings or referrers.
MX accepts mail for active inboxes. No public SMTP AUTH, no open relay, no VRFY/EXPN.
API waits, signed webhooks, and private SMTP capture land with the Developer plan.