Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
sibbald.co.uk
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]
Checked via [email protected]
· 2026-03-18 01:59:48 UTC · ↺ Refresh
MX Hostnames
- sibbald-co-uk.mx1.arsmtp.com
- sibbald-co-uk.mx2.arsmtp.com
MX Priorities
- sibbald-co-uk.mx2.arsmtp.com: 20
- sibbald-co-uk.mx1.arsmtp.com: 10
A / AAAA Records
- 104.19.154.92 (no PTR)
Mail Server IPs
- 5.152.185.165 ↩ server371.appriver.com
- 5.152.188.16 ↩ server370.appriver.com
SOA Record
Raw SOA
ns1.whm1.itderby.co.uk support.amlltd.co.uk 2026030103 3600 1800 1209600 86400
Primary NS (mname)
ns1.whm1.itderby.co.uk
Admin Email (rname)
support@amlltd.co.uk
Serial
2026030103
Refresh
3600s
Retry
1800s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns1.whm1.itderby.co.uk
ns2.whm1.itderby.co.uk
SPF Record
✓ Soft Fail (~all)
v=spf1 +a +mx +ip4:109.176.185.62 +include:mailgun.org +include:spf.protection.outlook.com +include:servers.mcsv.net ~all
📊 DNS lookups: 5/10
~ Soft fail (~all) — moderate enforcement
DMARC Record
~ Quarantine
v=DMARC1;p=quarantine;rua=mailto:[email protected];ruf=mailto:[email protected];
~ Quarantine — good protection (failing mail goes to spam)
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected]
DKIM Selectors
✓ 6 found
selector1._domainkey
selector2._domainkey
default._domainkey
k1._domainkey
s1._domainkey
s2._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
1 record- SPFv=spf1 +a +mx +ip4:109.176.185.62 +include:mailgun.org +include:spf.protection.outlook.com +include:servers.mcsv.net ~all
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 sibbald.co.uk
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits