SPF Lookup Counter: Check the 10 DNS Lookup Limit
Count every DNS lookup in a domain's SPF record against the RFC 7208 limit of 10, find void lookups, duplicates and dead terms, and get a trimmed or minimally flattened record.
October 6, 2026
Find a DKIM Selector: Headers, Panel Defaults and Key Checks
Find a domain's DKIM selector from the DKIM-Signature header, the cPanel, DirectAdmin, Microsoft 365 and Google defaults, and check that the published key is valid.
October 6, 2026
Split a 2048-bit DKIM TXT Record Over 255 Characters
Split a 2048-bit DKIM TXT record over 255 characters correctly in cPanel, DirectAdmin, Cloudflare and BIND, with lab-tested commands to build and verify the strings.
October 6, 2026
DKIM Key Generator: 2048-bit Key Pair and DNS Record
Generate a DKIM RSA key pair in your browser and get the TXT record, PEM keys and install steps for OpenDKIM, Exim, cPanel and DirectAdmin.
October 6, 2026
Gmail and Yahoo Bulk Sender Requirements: 2026 Host Checklist
Gmail and Yahoo bulk sender rules for 2026: the 5,000-a-day threshold, SPF, DKIM, DMARC alignment, one-click unsubscribe, 0.3% spam rate and a host checklist.
October 6, 2026
One-Click Unsubscribe (RFC 8058) for Exim, Postfix, WordPress
Add RFC 8058 one-click unsubscribe correctly: List-Unsubscribe and List-Unsubscribe-Post headers, DKIM signing in Exim and OpenDKIM, a WordPress example and a tested endpoint.
October 6, 2026
Outlook 550 5.7.515: Fix the High-Volume Sender Rejection
Fix Outlook.com 550 5.7.515 "sending domain does not meet the required authentication level": the 5,000-a-day rule, SPF, DKIM, DMARC and alignment checks.
October 6, 2026
Emails Going to Junk in Outlook and Hotmail: Sender-Side Fix
Why your mail lands in Outlook.com or Hotmail junk and how to fix it from the sending side: authentication, IP checks, SNDS reputation, JMRP complaints and content.
October 6, 2026
BIMI VMC vs CMC: Requirements, DMARC and Which Inboxes Show Logos
BIMI VMC vs CMC compared: trademark vs 12-month prior use, DMARC enforcement, SVG Tiny PS rules, and which mailbox providers (Gmail, Yahoo, Apple) show the logo.
October 6, 2026
MTA-STS on cPanel and DirectAdmin: Policy File and TLS-RPT
Set up MTA-STS on cPanel or DirectAdmin: create the mta-sts subdomain, host .well-known/mta-sts.txt with a valid certificate, add the DNS and TLS-RPT records and test.
October 6, 2026
Restore a File, Database or Account from a DirectAdmin Backup (CLI, Tested)
Restore one file, one database or a whole account from a DirectAdmin .tar.zst backup on the command line. Tested on DirectAdmin 1.712 with real screenshots.
October 6, 2026
Force HTTPS for a Domain in DirectAdmin (Tested on 1.712)
Redirect every http:// address of a DirectAdmin domain to https:// with Force SSL, from the panel or the API, and check it with a redirect test. Tested on DirectAdmin 1.712.
October 6, 2026