Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
casteelair.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-25 07:51:31 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
- 141.193.213.20 (no PTR)
- 141.193.213.21 (no PTR)
Mail Server IPs
- 170.10.132.242 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.132.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.141 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.128.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.242 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.141 ↩ us-smtp-inbound-1.mimecast.com
SOA Record
Raw SOA
dns1.easydns.com zone.easydns.com 1774271359 3600 600 604800 300
Primary NS (mname)
dns1.easydns.com
Admin Email (rname)
zone@easydns.com
Serial
1774271359
Refresh
3600s
Retry
600s
Expire
604800s
Minimum TTL
300s
Nameservers (NS)
dns2.easydns.net
dns1.easydns.com
dns3.easydns.ca
SPF Record
✓ Strict (-all)
v=spf1 include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:_spf.intacct.com include:_spf.samanage.com -all
📊 DNS lookups: 4/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; adkim=r; aspf=s; ruf=mailto:[email protected]; rua=mailto:[email protected], mailto:[email protected]; pct=100
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Strict
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected], mailto:[email protected]
DKIM Selectors
✓ 4 found
selector1._domainkey
selector2._domainkey
dkim._domainkey
k1._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- MS=ms28371378
- SPFv=spf1 include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:_spf.intacct.com include:_spf.samanage.com -all
- wrike-verification=NjcyMzY0ODo0MzVhODQ5NjU5YTg4YWFhMzQxMzE5ZDJkZGMwNTgxOGJhNmY4ZGQ4ZDRjYzU4ODgzYzdmNzgwNTg1MzlmMmE5
- e2ma-verification=bmzeb
- 0ed1fe018a9927911a08d24b02b0e6146902330624
- MS=ms65773344
- knowbe4-site-verification=513c333b8dce630d827853e4f1eb82f0
Free · No signup required
Add email validation to your forms
Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.
<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Full email verification for casteelair.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits