Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
redpen.com
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
⚠ Yes
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-14 01:51:59 UTC · ↺ Refresh
MX Hostnames
- in1-smtp.messagingengine.com
- in2-smtp.messagingengine.com
MX Priorities
- in2-smtp.messagingengine.com: 20
- in1-smtp.messagingengine.com: 10
A / AAAA Records
- 172.67.131.154
- 104.21.4.33
- 2606:4700:3035::ac43:839a
- 2606:4700:3037::6815:421
Mail Server IPs
- 202.12.124.218 ↩ stl-mx-03.messagingengine.com
- 202.12.124.219 ↩ stl-mx-04.messagingengine.com
- 202.12.124.216 ↩ stl-mx-01.messagingengine.com
- 202.12.124.217 ↩ stl-mx-02.messagingengine.com
- 103.168.172.217 ↩ phl-mx-02.messagingengine.com
- 103.168.172.218 ↩ phl-mx-03.messagingengine.com
- 103.168.172.219 ↩ phl-mx-04.messagingengine.com
- 103.168.172.220 ↩ phl-mx-05.messagingengine.com
- 103.168.172.221 ↩ phl-mx-06.messagingengine.com
- 103.168.172.222 ↩ phl-mx-07.messagingengine.com
- 103.168.172.223
- 103.168.172.216
SOA Record
Raw SOA
isla.ns.cloudflare.com dns.cloudflare.com 2398745102 10000 2400 604800 1800
Primary NS (mname)
isla.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2398745102
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
isla.ns.cloudflare.com
ken.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 include:spf.messagingengine.com include:mailgun.org -all
📊 DNS lookups: 2/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; sp=reject; pct=100; adkim=s; aspf=s; rua=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Strict
· DKIM alignment: Strict
📧 Reports → mailto:[email protected]
↳ Subdomain policy: reject
DKIM Selectors
✓ 13 found
google._domainkey
selector1._domainkey
selector2._domainkey
default._domainkey
mail._domainkey
dkim._domainkey
k1._domainkey
s1._domainkey
s2._domainkey
zoho._domainkey
sendgrid._domainkey
mxvault._domainkey
amazonses._domainkey
⚠ Public key (p=) missing in DKIM record for selector google.
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
2 records- SPFv=spf1 include:spf.messagingengine.com include:mailgun.org -all
- google-site-verification=tUQiBbYwqbesXFf7K0MXUh9XvvRH15i64J9LvjjthsE
Full email verification for redpen.com
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