Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
gdt.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-20 13:12:43 UTC · ↺ Refresh
MX Hostnames
- us-smtp-inbound-2.mimecast.com
- us-smtp-inbound-1.mimecast.com
MX Priorities
- us-smtp-inbound-2.mimecast.com: 10
- us-smtp-inbound-1.mimecast.com: 10
A / AAAA Records
- 162.159.134.42 (no PTR)
Mail Server IPs
- 170.10.128.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.132.242 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.141 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.141 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.221 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.128.242 ↩ us-smtp-inbound-2.mimecast.com
SOA Record
Raw SOA
ns-2.awsdns-00.com awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-2.awsdns-00.com
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-662.awsdns-18.net
ns-1168.awsdns-18.org
ns-1785.awsdns-31.co.uk
ns-2.awsdns-00.com
SPF Record
✓ Soft Fail (~all)
v=spf1 include:_spf.bullhornmail.com include:us._netblocks.mimecast.com include:aspmx.pardot.com include:spf.protection.outlook.com include:transmail.net include:_spf.qualtrics.com include:5524944.spf07.hubspotemail.net include:_spf.salesforce.com ip4:198.207.147.224/27 ip4:204.239.0.224/27 ip4:216.230.14.224/27 ip4:198.207.145.0/24 ip4:68.232.154.212 ip4:68.232.155.248 ~all
📊 DNS lookups: 8/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
~ Quarantine
v=DMARC1;p=quarantine;rua=mailto:[email protected],mailto:[email protected];ruf=mailto:[email protected],mailto:[email protected];fo=1;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: selector1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
7 records- smartsheet-site-validation=P9TQsnUBWpsy85VUAUqyl3eARlJYt0Tg
- SPFv=spf1 include:_spf.bullhornmail.com include:us._netblocks.mimecast.com include:aspmx.pardot.com include:spf.protection.outlook.com include:transmail.net include:_spf.qualtrics.com include:5524944.spf07.hubspotemail.net include:_spf.salesforce.com ip4:198.207.147.224/27 ip4:204.239.0.224/27 ip4:216.230.14.224/27 ip4:198.207.145.0/24 ip4:68.232.154.212 ip4:68.232.155.248 ~all
- apple-domain-verification=cMtoRemS6X7j6ArI
- atlassian-domain-verification=amxgaEmzGwf/1ZbEzJJcAGql1ZLtF4yac0P7yNQEchaGa8mqmSCexRF1SRwQ8uge
- docusign=756a66bb-e2b3-45a3-a0a7-719fac4f9b77
- google-site-verification=v2U1tTICjnKFgPL3KohQ7HKPGfqaWyzaYIRviwxLujk
- openai-domain-verification=dv-dyh2ccU2kY70BZCcr2aEGmLS
Full email verification for gdt.com
Run SMTP check, SPF/DKIM/DMARC and catch-all detection.
SPF / DKIM / DMARC Get 1,000 Free Credits