Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
irhythmtech.com
Yes
✓ Yes
Mimecast
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-25 20:33:48 UTC · ↺ Refresh
MX Hostnames
- us-smtp-inbound-1.mimecast.com
- us-smtp-inbound-2.mimecast.com
MX Priorities
- us-smtp-inbound-2.mimecast.com: 20
- us-smtp-inbound-1.mimecast.com: 10
A / AAAA Records
- 151.101.195.10 (no PTR)
- 151.101.131.10 (no PTR)
- 151.101.67.10 (no PTR)
- 151.101.3.10 (no PTR)
Mail Server IPs
- 170.10.128.221 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.141 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.141 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.128.242 ↩ us-smtp-inbound-2.mimecast.com
- 170.10.132.221 ↩ us-smtp-inbound-1.mimecast.com
- 170.10.132.242 ↩ us-smtp-inbound-2.mimecast.com
SOA Record
Raw SOA
ns-10.awsdns-01.com awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-10.awsdns-01.com
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-1133.awsdns-13.org
ns-1942.awsdns-50.co.uk
ns-876.awsdns-45.net
ns-10.awsdns-01.com
SPF Record
✓ Soft Fail (~all)
v=spf1 include:us._netblocks.mimecast.com include:fdspfus.freshemail.io include:emailus.freshservice.com include:_smtpsvc.dnsmadeeasy.com include:_spf.salesforce.com include:_spf.mailgun.org ~all
📊 DNS lookups: 6/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
~ Quarantine
v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1;
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 3 found
k1._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 chars (valid)
✓ DKIM properly configured for selector: k1
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
21 records- _gitlab-pages-verification-code.irhythmtech.com TXT gitlab-pages-verification-code=16bd04b8a5cac1640593b673b99db880
- docusign=ea54b28b-a076-4940-a14b-0acad8164e0d
- SPFv=spf1 include:us._netblocks.mimecast.com include:fdspfus.freshemail.io include:emailus.freshservice.com include:_smtpsvc.dnsmadeeasy.com include:_spf.salesforce.com include:_spf.mailgun.org ~all
- pendo-domain-verification=-nrq8xRMuIljyyrB8eNNL1z23_0apple-domain-verification=8pFGJkRuDRrIESfMqaivazrOlYhRYOqP4WrvYKNuPDQ
- virtru-site-verify=PToJ1U5wRu4MvKq20V1z2X0jjcOgkuaPbZL7vLt1
- MS=ms36811153
- atlassian-domain-verification=UHm/ZbD8kbZsVvZbicaNTeStH1zU6gECgXlUtq741quYW76odGSClV5ssDc9xdb8
- openai-domain-verification=dv-Jx5e5EgoN0B8YFPY6pdeTr6A
- atlassian-sending-domain-verification=b4d72682-43a7-4ef2-86f7-c0f6c5422325
- google-site-verification=EP7kKEtzyXtjKo6CS4eb9Wop5QwTyxgdvO6-F1hJi1E
- docusign=ec3b5eb2-1b79-478d-a8b3-5a6c58635b52
- google-site-verification=cjqr5b0motJeK11pFgh6c7Y9Xc46Vtx0KDoh_HhqeuQ
- miro-verification=c799eb55ed3981a93503182c105137c5281f7ebc
- jamf-site-verification=maJ0whuLqZ4GXH9UkRPVSw
- atlassian-domain-verification=QZZ6HANhYZGCuP9FcSIamemZPbuRayeGdIjAd5eiLku7xsb1YAM2hdFjc/hp9X1K
- google-site-verification=_r6wHmlhmVr7GEy3Nql3RP0xesp_yvZUorqoN0KzE38
- onetrust-domain-verification=8a8fb9ae04d840229e6465d0ae911871
- smartsheet-site-validation=oe0-35wXVao9xQhmNYdsOiNzSV0hgbg-
- ZOOM_verify_MXxiTKSaTx6clEldLvRcdg
- adobe-idp-site-verification=a7cb1141afbb7ae0f955bb5e90bbd1996f2343413d01625dae33b4f94286e36e
- Foxit-domain-verification=179295a949c3445ad6eb4bc407820870
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