Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
tvc.org
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-23 21:28:08 UTC · ↺ Refresh
MX Hostnames
- us-smtp-inbound-2.mimecast.com
- us-smtp-inbound-1.mimecast.com
MX Priorities
- us-smtp-inbound-1.mimecast.com: 10
- us-smtp-inbound-2.mimecast.com: 10
A / AAAA Records
- 104.21.78.167 (no PTR)
- 172.67.136.2 (no PTR)
- 2606:4700:3031::6815:4ea7 (no PTR)
- 2606:4700:3035::ac43:8802 (no PTR)
Mail Server IPs
- 170.10.132.221 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.141 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.242 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.128.141 ↩ 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
SOA Record
Raw SOA
ns11.constellix.com dns.constellix.com 2015010235 43200 3600 1209600 180
Primary NS (mname)
ns11.constellix.com
Admin Email (rname)
dns@constellix.com
Serial
2015010235
Refresh
43200s
Retry
3600s
Expire
1209600s
Minimum TTL
180s
Nameservers (NS)
ns51.constellix.net
ns61.constellix.net
ns11.constellix.com
ns21.constellix.com
ns31.constellix.com
ns41.constellix.net
SPF Record
✓ Strict (-all)
v=spf1 ip4:162.223.126.16 include:us._netblocks.mimecast.com include:servers.mcsv.net include:_spf.psm.knowbe4.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected]; fo=1; aspf=s;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Strict
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],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
11 records- bw=MJVJU24APQ6GpRlX1KIr9NN466SoRBs3YB5oS5MugTQQ
- infoblox-domain-mastery=8618f1581c3e3dadda73655150d987bd59c48a19e2f3ecd1e202d8d7dd41195bca
- SPFv=spf1 ip4:162.223.126.16 include:us._netblocks.mimecast.com include:servers.mcsv.net include:_spf.psm.knowbe4.com -all
- B/JPxIJtBnNYGLpbjyUP1Q8+ORIJu6
- cisco-ci-domain-verification=39a1e317f6f55d6e53a474f02bdf74a08cc50b20b9a23ef17482dd68a5874ca1
- ZOOM_verify_fZBjziVxRqafV3VI7Xoy4w
- dropbox-domain-verification=e8ff52y2zb0j
- docusign=a815fa52-e21d-4135-a751-ab85a587f99e
- duo_sso_verification=jDetZ4bez0eKi3e19yL1zHkrD4Ti943PA6NLL8SMypmWfPWmjqzpTr8VoYE8KdEO
- smartsheet-site-validation=HjqGiF4Q8_YuqRDfCjwRaVyMtn2OCnCQ
- atlassian-domain-verification=NP4pqlBbagvWwafcqaOpQTk7Dd5XdbAwgDdlsWWPrtIBeet9s6TqUKZD/C851PIK
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 tvc.org
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits