Email deliverability guides

Why are my emails going to spam?The real technical reasons emails land in spam — SPF, DKIM, DMARC, blacklists, reverse DNS, content and list quality — and exactly how to fix each one. SPF, DKIM and DMARC explainedA plain-language explanation of SPF, DKIM and DMARC, how they work together, example records, and the order to set them up in. How to set up DMARC, step by stepCreate your first DMARC record, read the reports, authenticate every sender and move safely from p=none to quarantine and reject. Gmail and Yahoo sender requirements: the checklistWhat Gmail and Yahoo require from email senders since February 2024 — authentication, DMARC, one-click unsubscribe, spam rate and DNS — with a checklist. How to get your IP or domain off a blacklistFind out which blacklist lists you, fix the cause, and request removal from Spamhaus, Microsoft, Barracuda, SpamCop and others — step by step. Fix SPF "too many DNS lookups"Why SPF has a 10 DNS lookup limit, how to count lookups, and five safe ways to get back under the limit without breaking email. Email verification: how it worksWhat email verification checks — syntax, domain, MX, mailbox, disposable and role addresses, catch-all — and when to verify your lists. MX records explainedWhat MX records are, how priority works, how to check them and how to set them up correctly for Google Workspace, Microsoft 365 and other providers.

Google Workspace SPF, DKIM & DMARCDNS records and steps for Google Workspace. Microsoft 365 SPF, DKIM & DMARCDNS records and steps for Microsoft 365. Zoho Mail SPF, DKIM & DMARCDNS records and steps for Zoho Mail. Proton Mail SPF, DKIM & DMARCDNS records and steps for Proton Mail. Fastmail SPF, DKIM & DMARCDNS records and steps for Fastmail. iCloud Mail SPF, DKIM & DMARCDNS records and steps for iCloud Mail. Yandex 360 SPF, DKIM & DMARCDNS records and steps for Yandex 360. Hostinger Email SPF, DKIM & DMARCDNS records and steps for Hostinger Email. Namecheap Private Email SPF, DKIM & DMARCDNS records and steps for Namecheap Private Email. Titan Email SPF, DKIM & DMARCDNS records and steps for Titan Email. GoDaddy Email SPF, DKIM & DMARCDNS records and steps for GoDaddy Email. SendGrid SPF, DKIM & DMARCDNS records and steps for SendGrid. Mailgun SPF, DKIM & DMARCDNS records and steps for Mailgun. Amazon SES SPF, DKIM & DMARCDNS records and steps for Amazon SES. Postmark SPF, DKIM & DMARCDNS records and steps for Postmark. Brevo (Sendinblue) SPF, DKIM & DMARCDNS records and steps for Brevo (Sendinblue). Mailchimp SPF, DKIM & DMARCDNS records and steps for Mailchimp.

SMTP error codesWhat every common bounce and SMTP error means and how to fix it.