PHP-FPM Calculator: pm.max_children and Spare Servers
Calculate pm.max_children, start_servers and spare servers from RAM and PHP-FPM worker size, with cPanel and DirectAdmin config locations.
October 6, 2026
ERR_CERT_COMMON_NAME_INVALID on cPanel: Wrong Certificate Served
Fix ERR_CERT_COMMON_NAME_INVALID on cPanel: find which certificate each IP and port serves, then fix DNS, AutoSSL coverage, panel ports, mail SNI or the proxy.
October 6, 2026
Let’s Encrypt Changes 2025 to 2028: What Hosting Admins Must Do
Let's Encrypt changes from 2025 to 2028: no expiry emails, no OCSP, no clientAuth EKU, Gen Y intermediates, 64- then 45-day certificates, and what cPanel and DirectAdmin admins must do.
October 6, 2026
200-Day SSL Certificates and DCV Reuse: What It Means for AutoSSL
The CA/B Forum schedule: 200-day certificates and DCV reuse from March 2026, then 100 and 47 days, retired email validation, DNSSEC checks, and what it means for AutoSSL and ACME.
October 6, 2026
SPF Too Many DNS Lookups: Fix PermError and the 10-Lookup Limit
Fix SPF PermError "too many DNS lookups": what counts toward the 10-lookup and void-lookup limits, how to count includes, and safe fixes.
October 6, 2026
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
DNS TXT Record Splitter: Split Long Values Into 255-Byte Strings
Split long TXT values (DKIM keys, SPF) into 255-byte quoted strings for BIND and Cloudflare, or join split strings back into one value.
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