Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
knobbe.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-20 21:58:51 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: 20
A / AAAA Records
- 23.185.0.4 (no PTR)
- 2620:12a:8001::4 (no PTR)
- 2620:12a:8000::4 (no PTR)
Mail Server IPs
- 170.10.132.141 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.221 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.128.242 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.132.242 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.141 ↩ us-smtp-inbound-2.mimecast.com
SOA Record
Raw SOA
jacob.ns.cloudflare.com dns.cloudflare.com 2398585019 10000 2400 604800 1800
Primary NS (mname)
jacob.ns.cloudflare.com
Admin Email (rname)
dns@cloudflare.com
Serial
2398585019
Refresh
10000s
Retry
2400s
Expire
604800s
Minimum TTL
1800s
Nameservers (NS)
simone.ns.cloudflare.com
jacob.ns.cloudflare.com
SPF Record
✓ Strict (-all)
v=spf1 mx ip4:173.227.19.159 include:spf.protection.outlook.com include:_netblocks.mimecast.com include:spf.smtp2go.com -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]
✓ Reject — strongest protection
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: s1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
5 records- apple-domain-verification=37Dp-DPt7j5L_DvxrVWeK1SDk9i0mcje47AtCdFTs_8
- rcls5bhd46kv2tvn0vkfgmo5ni
- SPFv=spf1 mx ip4:173.227.19.159 include:spf.protection.outlook.com include:_netblocks.mimecast.com include:spf.smtp2go.com -all
- MS=ms30062173
- UY2jAm3YhD2a3jevdJM5spqrz+C1lPGm1Cnry6vgYzQkkgbHQ2ZyXSqFUJY93iz1zKTnicxc/3ThdTIExvnd3w==
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