SPF, DKIM & DMARC

Email deliverability is the ability of your messages to reach the recipient's inbox rather than the spam folder or a hard bounce. It depends on authentication (SPF/DKIM/DMARC), sender reputation, list quality, content, and engagement. Verified data and a warmed-up sending domain are the foundation of strong deliverability.

Sender reputation is a score mailbox providers assign to a sending domain and IP based on history — bounce rates, spam complaints, engagement, and authentication. A strong reputation lands mail in the inbox; a poor one routes it to spam. It is built slowly through warmup and clean lists, and damaged quickly by sending to unverified addresses.

Email verification is the process of confirming that an email address exists and can receive mail before you send to it. A thorough pipeline runs syntax, DNS/MX, SMTP, catch-all, disposable, and role checks plus authentication analysis, then assigns a deliverability tier. Verifying first protects sender reputation and cuts bounce rates.

Bounce rate is the percentage of sent emails that fail to deliver. Hard bounces are permanent failures (invalid address); soft bounces are temporary (full mailbox). High bounce rates signal poor list quality to mailbox providers and damage sender reputation, which is why verifying addresses before sending is essential.