yssf.io

Valid Email Server
Domain Lookup › yssf.io
Live data — DNS records and disposable check were just fetched and saved.

Domain Overview

DNS: ⚡ live Checker: ⚡ live
yssf.io
Yes
✓ Yes
Unknown
No
No
⚠ Yes
No
No
Did you mean: [email protected]

Checked via [email protected] · 2026-07-27 19:58:50 UTC · ↺ Refresh

Add email validation to your forms — free

Add our free script to block 10,000+ disposable domains + perform other checks. No signup, unlimited checks.

MX validation Disposable detection Role accounts
Add to your signup form
<script src="https://check.verifyswift.com/"></script>
One line · No registration · See full docs & demo → · Customize →

MX Hostnames

  • mailsec.protonmail.ch
  • mail.protonmail.ch

MX Priorities

  • mail.protonmail.ch: 10
  • mailsec.protonmail.ch: 20

A / AAAA Records

  • 76.76.21.21 (no PTR)

Mail Server IPs

  • 176.119.200.128 ↩ mail.protonmail.ch
  • 185.70.42.128 ↩ mail.protonmail.ch
  • 185.205.70.128 ↩ mail.protonmail.ch
  • 185.205.70.129 ↩ mailsec.protonmail.ch
  • 176.119.200.129 ↩ mailsec.protonmail.ch
  • 185.70.42.129 ↩ mailsec.protonmail.ch

SOA Record

Raw SOA dns100.ovh.net tech.ovh.net 2083535280 86400 3600 3600000 60
Primary NS (mname)
dns100.ovh.net
Admin Email (rname)
tech@ovh.net
Serial
2083535280
Refresh
86400s
Retry
3600s
Expire
3600000s
Minimum TTL
60s

Nameservers (NS)

ns100.ovh.net
dns100.ovh.net

SPF Record

✓ Soft Fail (~all)
v=spf1 include:_spf.protonmail.ch mx ~all
📊 DNS lookups: 2/10
~ Soft fail (~all) — moderate enforcement

DMARC Record

✗ p=none
v=DMARC1; p=none
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed · DKIM alignment: Relaxed
⚠ No aggregate reports (rua= not set)

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

3 records
  • 1|www.yssf.io
  • protonmail-verification=99354abc758004bb2f591ce3e05288b6f7fdceed
  • SPFv=spf1 include:_spf.protonmail.ch mx ~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 · Customize →
See demo & docs
Deep verification
Full email verification for yssf.io

SMTP handshake, catch-all detection, custom validation rules, actual deliverability tests, and more.

No credit card required
Get 1,000 Free Credits