Agent-sent mail is held to the same standard as any other. What actually decides whether it arrives:

Authenticate the domain

SPF, DKIM and DMARC. On carlyemail.com this is already done. On your own domain, verification sets it up — do not skip DMARC, which is increasingly the difference between the inbox and the spam folder at the large providers.

Warm up

A new domain sending thousands of messages on day one looks exactly like a compromised one. Start with tens per day and grow over a couple of weeks.

Watch the two numbers that matter

Both are on GET /v0/metrics/events. Crossing them does not degrade your delivery — it removes your ability to send.

Send mail people expect

The single biggest lever, and the least technical. An agent replying to someone who wrote in first will essentially never be marked as spam. An agent emailing strangers will be, no matter how well the DNS is configured.

Give people a way out

Honour unsubscribe requests immediately. A complaint costs roughly ten times what an unsubscribe does, and the person is equally gone either way.