Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
penguinrandomhouse.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-04-04 12:57:37 UTC · ↺ Refresh
MX Hostnames
- us-smtp-inbound-1.mimecast.com
- us-smtp-inbound-2.mimecast.com
MX Priorities
- us-smtp-inbound-1.mimecast.com: 10
- us-smtp-inbound-2.mimecast.com: 10
A / AAAA Records
- 170.171.208.137 (no PTR)
Mail Server IPs
- 170.10.132.221 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.141 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.132.242 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.128.242 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.128.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.141 ↩ us-smtp-inbound-1.mimecast.com
SOA Record
Raw SOA
ns-1259.awsdns-29.org awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-1259.awsdns-29.org
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-643.awsdns-16.net
ns-1259.awsdns-29.org
ns-1709.awsdns-21.co.uk
ns-362.awsdns-45.com
SPF Record
✓ Soft Fail (~all)
v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
📊 DNS lookups: 1/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; pct=100; adkim=r; aspf=r; rua=mailto:[email protected],mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected],mailto:[email protected]; fo=1; ri=3600
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected],mailto:[email protected]
DKIM Selectors
✓ 3 found
k1._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: k1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
13 records- p^80Ofvy%178DnED&JH$OktbSDSDHdBu8r5TXqXJUzrLTNplO6PB1VAb%#xV06wEKl7lOoFd2erdL@$w0BThd9#s6rEd%9C%tPu
- sophos-domain-verification=30c16c4ad4dd85043d6766d195b3be1bf04c9425e55a4a79745bd7a135474f3b
- twilio-domain-verification=fc6fe5f3866856223b427fe22f87cacc
- SPFv=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
- HmQrtF+YeGABOOs4sUIGNzx5oH/hxa/uuKITM72aP2D3Mmo45+IYTHRRNErkCFI5FluDKT7Og9fYZwF4n3wWlw==
- applause-verification:e7f9bc17-1978-415a-83ab-955ebc93e7eb
- apple-domain-verification=fSsk2qTskZIXUkhu
- asv=300738b15ca5d787a896887a6179da76
- atlassian-domain-verification=Kl3ByU1tsfV9fKiC7TDDZYz1uCeTeUo0SSEh5SitZ9q99Ua74O571fgiIg//j5Hn
- canva-site-verification=qrGQ4gxWAdHknibYOR88zw
- d240bb6782951c680216e3b2c275a67a287ab413a4dbc83ff6
- miro-verification=20deb2e76b80e8360f078ce72b4c1b020ccbe7e1
- openai-domain-verification=dv-Rhm7Hg5yRtoNsmysb1sZR4hb
Full email verification for penguinrandomhouse.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits