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Why e-mails from your domain land in spam, and how to fix it. We explain SPF, DKIM, DMARC and MX records in plain words, with example DNS entries. Articles show common mistakes such as too many SPF lookups, missing DKIM selectors or a DMARC policy that is never enforced. Each guide ends with the exact records to add or change. We also cover how to protect your domain from people sending e-mail in your name. Good e-mail authentication makes invoices, offers and password resets reach the inbox.
2026/10/04 · 8分で読めますDKIM Selectors Explained: How to Find Yours and Use Several
A DKIM selector tells receivers where to find your public key. Learn how to find the selector you use, run several senders and rotate…
2026/10/01 · 7分で読めますPostmaster and Abuse Mailboxes: Why Every Domain Needs Them
Postmaster, abuse and other role addresses let mail servers and people report problems with your domain. Learn which ones you need and how to…
2026/10/01 · 7分で読めますDMARC Failure Reports (ruf): What They Show and Their Limits
DMARC failure reports send details of individual messages that fail checks. Learn what ruf and fo do, why few providers send them, and privacy…
2026/10/01 · 7分で読めますCatch-All Email Addresses: Pros, Cons and the Spam Problem
A catch-all mailbox accepts mail sent to any address at your domain. See the benefits, the spam and security costs, and the safer alternatives…
2026/10/01 · 8分で読めますNo-Reply Email Addresses: Why They Hurt Deliverability
No-reply addresses frustrate customers and waste useful engagement signals. See when they cause harm, what to use instead, and how to route replies sensibly.
2026/10/01 · 8分で読めますSMTP Ports 25, 587 and 465: Which One Should You Use?
Port 25, 587 or 465? Learn what each SMTP port is for, which to use for your website or mail app, and how to…
2026/09/30 · 8分で読めますGreylisting Explained: Why Some Emails Arrive Late
Greylisting makes a mail server refuse the first message from an unknown sender until it retries. Learn how it works, why it delays email…
2026/09/30 · 7分で読めますEmail Sending Limits: Why Your Messages Get Throttled
Sending limits and throttling delay or block email when you send too much, too fast. Learn the limits that apply, how to read deferrals…
2026/09/30 · 8分で読めますSpam Trigger Words: What Really Gets an Email Filtered
Lists of spam trigger words are mostly a myth. Learn what modern spam filters actually weigh, which content habits still hurt and what to…
2026/09/30 · 8分で読めますFrom Name and Address: Email Sender Details That Build Trust
The From name, From address and Reply-To decide whether people trust and open your email. Learn how to choose them, avoid no-reply and keep…
2026/09/30 · 8分で読めますWhy Your Emails Land in the Gmail Promotions Tab
The Gmail Promotions tab is not spam, but it changes how people see your mail. Learn why messages are sorted there and what you…
2026/09/29 · 8分で読めますBackscatter: Why You Get Bounces for Emails You Never Sent
Getting bounce messages for emails you never sent? That is backscatter from spoofed spam. Learn how to tell if you were hacked and how…