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pitfall: If your confirmation email is filtered as spam, no one confirms. Make sure SPF, DKIM and DMARC are configured for the sending domain — see our

Internal corporate block list, ISP filter list DNSBL / RBL A blacklist queried via the DNS protocol Spamhaus SBL, Spamcop, Barracuda, SORBS URI / domain blacklist

, rented, scraped, or harvested — never qualify as proof of consent, even if the source presented them as “opt-in”. Sending to third-party addresses is a hard breach

every outgoing message. The receiving server verifies that signature against a public key in your DNS, confirming the message was really sent from your domain and

non-existent domain The recipient's mail server has blocked the delivery There is an error in the spelling of the email address A deleted mailbox To make a

; host securely and link. Include a plain-text version: Improves accessibility and deliverability. Authenticate your domain: Set up SPF, DKIM, and DMARC for

strategy. This approach goes beyond writing catchy subject lines or sending campaigns at the “right” time. It’s about embedding respect for subscriber data into the

, email providers like Gmail, Yahoo, think that you must be sending spam emails. When you continue sending emails to people who have junked you, you end up

is important that you have a valid and continuously revised response address. Use email addresses with your own name in your domain, such as Peter

ship bulletproof code fast, and an Analyst to connect email to revenue. Borrow deliverability expertise part-time to keep your domain healthy. Center of