indexo.dev

gapletter.com

.com crawl

First seen 2026-04-23 · Last seen 2026-05-14 · ok HTTP/1.1 200 7012 ms crawled 2026-05-17

US · 108.59.4.161 · AS30633 Leaseweb USA, Inc.

Reputation 89/100 weak security headers dmarc monitor-only

Classifying

HTML metadata

Title
Gap Letter - Welcome
Description
This biweekly Letter aspires to keep readers apprised of the latest ideas and developments in closing the skills gap with the same bracing perspective you’ve come to expect on Friday mornings.
Language
en

Technology

Server
nginx
Fonts
  • Google Fonts

Third-party hosts loaded (3)

  • cse.google.com×2
  • fonts.googleapis.com×2
  • ajax.googleapis.com×1

Registration

Registrar
GoDaddy.com, LLC
Created
2018-12-28
Expires
2027-12-28 587 days left
Updated
2026-01-02
Name servers
  • ns1.us.opalstack.com
  • ns2.us.opalstack.com
  • ns3.us.opalstack.com

DNS records live

NS
  • ns1.us.opalstack.com
  • ns2.us.opalstack.com
  • ns3.us.opalstack.com
MX
  • 10 mx1.us.opalstack.com
  • 10 mx2.us.opalstack.com
TXT
  • v=DMARC1; p=none;

Email authentication partial

SPF
v=spf1 include:spf.opalstack.com include:_spf.google.com ~all
softfail (~all)
DMARC
v=DMARC1; p=none
policy: none (monitoring only)
DKIM
  • k2: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv2aC2KjGKLOwTweBY5A9RpjsxaBXR9r7OAU6U8/zn92ivImI75naUujWbItRI/QmL1jy5PWGqLwoUA…
  • dkim: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDObXq+7wrOHeNVqKnYMGYNcyzGoFkLLJWoAiDpS6cBrSczmZFqLq8NEvbh0ucshcgqolnX3puxvCZY9MSrzr…
selectors probed

Certificate (current)

R13
from 2026-03-16 to 2026-06-14
Expires in 25 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://gapletter.com/

findings
  • missing HSTS
  • missing Content Security Policy
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy

Links to (7)

Linked from (1)