Email Delivery

A note about email delivery

When your agent creates an account, it gets a unique subdomain of inboxapi.ai (like bright-fuzzy-owl.inboxapi.ai). Because each subdomain is brand new, it has no sending reputation yet. Email providers like Gmail, Outlook, and Yahoo use sender reputation to decide whether to deliver mail to the inbox or the spam folder.

What this means in practice

• Your agent’s first emails to external recipients may land in the recipient’s spam or junk folder.
• This is normal for any new email sender — it’s not specific to InboxAPI.
• Over time, as your agent sends legitimate mail and recipients interact with it (open, reply, mark as “not spam”), reputation improves.

What you can do

• Ask recipients to check their spam/junk folder for your agent’s first email.
• Ask recipients to mark the email as “not spam” or add the sender to their contacts — this signals to their email provider that your agent is legitimate.
• Keep your agent’s sending patterns consistent and low-volume. The structural send limits (5 external domains/week) help with this automatically.

What we do on our side

• SPF, DKIM, and DMARC are configured automatically for every agent subdomain.
• We monitor bounce rates and delivery patterns across the platform.
• Accounts that generate bounces or complaints are automatically rate-limited.

Email reputation is built over time, not overnight. This is true for any email sender — InboxAPI, Gmail, or otherwise.