Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
celsolisboa.edu.br
Yes
✓ Yes
Outlook
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-31 08:30:55 UTC · ↺ Refresh
MX Hostnames
- celsolisboa-edu-br.mail.protection.outlook.com
MX Priorities
- celsolisboa-edu-br.mail.protection.outlook.com: 0
A / AAAA Records
- 34.226.46.171 ↩ ec2-34-226-46-171.compute-1.amazonaws.com
- 204.236.211.16 ↩ ec2-204-236-211-16.compute-1.amazonaws.com
- 107.23.27.42
- 34.233.169.240
- 34.204.226.37
- 54.211.136.202
Mail Server IPs
- 52.101.10.5 ↩ mail-bn6pr04cu00105.inbound.protection.outlook.com
- 52.101.9.24 ↩ mail-bl2pr02cu00400.inbound.protection.outlook.com
- 52.101.9.11 ↩ mail-bl2pr04cu00103.inbound.protection.outlook.com
- 52.101.10.12 ↩ mail-bn1pr21cu00204.inbound.protection.outlook.com
- 2a01:111:f403:c946::6 ↩ mail-ch5pr02cu00406.inbound.protection.outlook.com
- 2a01:111:f403:f902:: ↩ mail-bl2pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:f90b:: ↩ mail-bn6pr04cu00100.inbound.protection.outlook.com
- 2a01:111:f403:c902::16 ↩ mail-byapr04cu00306.inbound.protection.outlook.com
SOA Record
Raw SOA
ns-1894.awsdns-44.co.uk awsdns-hostmaster.amazon.com 1 7200 900 1209600 86400
Primary NS (mname)
ns-1894.awsdns-44.co.uk
Admin Email (rname)
awsdns-hostmaster@amazon.com
Serial
1
Refresh
7200s
Retry
900s
Expire
1209600s
Minimum TTL
86400s
Nameservers (NS)
ns-1384.awsdns-45.org
ns-1894.awsdns-44.co.uk
ns-283.awsdns-35.com
ns-780.awsdns-33.net
SPF Record
✓ Soft Fail (~all)
v=spf1 include:_spf.google.com include:_spf.elasticemail.com include:_spf.localservices.com.br include:spf.protection.outlook.com ~all
📊 DNS lookups: 4/10
~ 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
✓ 5 found
selector1._domainkey
selector2._domainkey
k1._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 216 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
6 records- cisco-ci-domain-verification=2130b5c97599ec8b567d9cc758dc924812959f4e84f0e8c7c39653149db4e17d
- ciscocidomainverification=2130b5c97599ec8b567d9cc758dc924812959f4e84f0e8c7c39653149db4e17d
- facebook-domain-verification=rydedpi3s1lf5nvlys68j0a2giu41o
- google-site-verification=5uVlALPTIbzfdtSwojrO8DT4heqjwve-rdzr9jXYs9o
- SPFv=spf1 include:_spf.google.com include:_spf.elasticemail.com include:_spf.localservices.com.br include:spf.protection.outlook.com ~all
- atlassian-domain-verification=/z1sTXy7LKU7CYPKt7yI6UnzSkdOsqVIoIysX/njgDUP9qzDQ7dJDu9oohs6Kp68
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 celsolisboa.edu.br
SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.
No credit card required
Get 1,000 Free Credits