Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
jmbrennan.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-23 14:54:44 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
- 151.101.130.159 (no PTR)
Mail Server IPs
- 170.10.132.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.132.242 ↩ us-smtp-inbound-1.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-2.mimecast.com
- 170.10.132.141 ↩ us-smtp-inbound-1.mimecast.com
SOA Record
Raw SOA
ns21.domaincontrol.com dns.jomax.net 2025022702 28800 7200 604800 600
Primary NS (mname)
ns21.domaincontrol.com
Admin Email (rname)
dns@jomax.net
Serial
2025022702
Refresh
28800s
Retry
7200s
Expire
604800s
Minimum TTL
600s
Nameservers (NS)
ns22.domaincontrol.com
ns21.domaincontrol.com
SPF Record
✓ Strict (-all)
v=spf1 include:us._netblocks.mimecast.com include:_spf.smtp.mailtrap.live a:smtp.jmbrennan.com -all
📊 DNS lookups: 3/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✓ Reject
v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected];
✓ Reject — strongest protection
📋 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
10 records- o0al5dpta3v3354qb4ul98jfq6
- 3zrfepi+KkI7/kIHo11UUmNe8FfYbYEjDyxeB/i9ezCFIP5CldrWWy8H6Mj08rfFgFjXNVJKZXK+sLc/dUJZHw==
- 69jqkjr8h6ukh3al6qo9lnp1f7
- MS=96A203D21E9B1FE4C6BB4BA9121338C560E2285B
- amf2h6t5n6ok5uf4h959sfsbl5
- SPFv=spf1 include:us._netblocks.mimecast.com include:_spf.smtp.mailtrap.live a:smtp.jmbrennan.com -all
- 9r0s1umvbicjp5hq39h4t3rhd6
- iyOSRQQwur7yHrChCw1pXbPXykhY3lf80Khxhpd3P0cDsZyc4qRHeiwljfwpYHaDU18EV07OAcmFKrlC7+bSVA==
- apple-domain-verification=b9TK33HYoN8aerCb
- 0ed1fe018aad8db3d8271e4853b6da743bad042912
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 jmbrennan.com
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits