Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
c21.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-23 07:33:00 UTC · ↺ Refresh
MX Hostnames
- usb-smtp-inbound-1.mimecast.com
- usb-smtp-inbound-2.mimecast.com
MX Priorities
- usb-smtp-inbound-2.mimecast.com: 10
- usb-smtp-inbound-1.mimecast.com: 10
A / AAAA Records
- 3.23.238.27 ↩ ec2-3-23-238-27.us-east-2.compute.amazonaws.com
- 3.134.39.225 ↩ ec2-3-134-39-225.us-east-2.compute.amazonaws.com
Mail Server IPs
- 170.10.152.242 ↩ usb-smtp-delivery-2.mimecast.com
- 170.10.150.242 ↩ usb-smtp-delivery-2.mimecast.com
SOA Record
Raw SOA
ns-236.awsdns-29.com awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-236.awsdns-29.com
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-236.awsdns-29.com
ns-788.awsdns-34.net
ns-1182.awsdns-19.org
ns-1619.awsdns-10.co.uk
SPF Record
✓ Soft Fail (~all)
v=spf1 include:spf.anywhere.re ip4:64.37.197.6 ip4:64.37.197.45 ip4:63.240.103.0/26 ip4:216.136.162.64/26 ip4:64.37.197.198 a:svvssmtp.century21.com ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1;
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 2 found
selector1._domainkey
selector2._domainkey
✓ Public key: 392 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
4 records- google-site-verification=ff1T-xLA63uWjkoEoJunqT4ItOEGTHjtGolIYKhPcRI
- SPFv=spf1 include:spf.anywhere.re ip4:64.37.197.6 ip4:64.37.197.45 ip4:63.240.103.0/26 ip4:216.136.162.64/26 ip4:64.37.197.198 a:svvssmtp.century21.com ~all
- MS=ms71345168
- fxds5p4sdtv2zn7z9cf65wcr46bws60d
Full email verification for c21.com
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