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Deliverability Email Warm-Up Guide: How to Warm a New Domain or IP Without Hurting Your ReputationMailbox providers have no history for a brand-new domain or IP address, so they treat large volumes from it with suspicion. Email warm-up is the prac… 25 May 2026 · 6 min readRead article → Sending and campaigns One-Click Unsubscribe: How to Add the List-Unsubscribe Header (RFC 8058)One-click unsubscribe lets a recipient leave your list from the mail client with a single tap, and Gmail and Yahoo require it from bulk senders of ma… 27 Apr 2026 · 6 min readRead article → Deliverability Dedicated IP vs Shared IP: Which Do You Need and How to Warm It UpA shared IP lets you send from addresses whose reputation is built by many customers together, while a dedicated IP is yours alone and carries only y… 21 Apr 2026 · 5 min readRead article → SMTP and API SMTP Settings Explained: Ports 25, 465, 587 and 2525, TLS and AuthenticationTo send email through an SMTP relay you need four settings: a host name, a port, an encryption mode and a username and password. This guide explains … 28 Mar 2026 · 6 min readRead article → Domains and DNS How to Read DMARC Aggregate Reports and Safely Move to p=rejectA DMARC aggregate report is a daily XML file from each mailbox provider that lists every source sending mail as your domain and whether it passed SPF… 17 Mar 2026 · 7 min readRead article → Deliverability Why Are My Emails Going to Spam? A Step-by-Step Troubleshooting ChecklistWhen emails land in spam the cause is almost always one of five things: failed authentication, a poor sender reputation, a listing on a blocklist, a … 10 Feb 2026 · 6 min readRead article → Deliverability Gmail, Yahoo and Outlook Bulk Sender Requirements: A Compliance ChecklistGmail, Yahoo and Outlook.com all set minimum rules for anyone who sends in volume: authenticate with SPF, DKIM and DMARC, make unsubscribing easy and… 15 Jan 2026 · 7 min readRead article → SMTP and API SMTP Bounce Codes Explained: How to Read 4xx and 5xx Errors and Fix ThemEvery bounced email carries an SMTP reply code and usually an enhanced status code that explains why it failed. A 4xx code is temporary and the sendi… 29 Jun 2025 · 7 min readRead article → Domains and DNS How to Authenticate a Sending Domain: SPF, DKIM and DMARC Setup GuideTo authenticate a sending domain you publish three DNS records: SPF (which servers may send), DKIM (a signature that proves the message was not alter… 14 Apr 2025 · 11 min readRead article →

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