Guides · Tag
deliverability
7 guides tagged deliverability.
Inboxes · Sep 29, 2026
DMARC Policy for an Autonomous Email Sender
DMARC for AI agent senders: why a fresh agent subdomain should start at p=reject, when that flips, and what sp, np and alignment actually cover.
Comparisons · Sep 29, 2026
Gmail Blocked My Bot From Sending Email: 4 Causes
Gmail blocked my bot from sending email: four different Google enforcement paths, the exact error strings for each, and which ones configuration can fix.
Inboxes · Sep 29, 2026
Why Your Agent's Email Lands in Spam
Why does my AI agent email go to spam? The three agent-specific causes, what the platform reports back, and the part no sender can see.
Developers · Sep 28, 2026
Agent Email Bounced 550 5.7.1: What It Means
Agent email bounced 550 5.7.1? Which variant you hit, why it is rarely your DNS on a shared domain, and why the agent must stop, not reword and resend.
Developers · Sep 28, 2026
Validating an Address Before Your Agent Sends
How to validate an email address before your agent sends: the syntax and DNS checks that are safe to run, and why probing the mailbox is not.
Developers · Sep 22, 2026
My Agent Says It Sent It. Nobody Received It
Your AI agent says it sent an email and nobody received it. Work the states in order, learn which ones emit no event at all, and never retry one.
Developers · Sep 21, 2026
Accepted vs Delivered: What an Email Status Proves
Queued, accepted, delivered, bounced, unknown: what each email status actually proves, what it does not, and the correct next action for every one of them.