zendesk.com
Live email deliverability and anti-spoofing audit. Every value below was read from public DNS at the moment this page was generated.
86/100 — Solid configuration with a few gaps worth closing. Accepts mail · Protected against spoofing · Hosted by Mimecast
Findings
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spf
SPF ends in ~all (softfail); unauthorised mail is marked rather than rejected.
v=spf1 ip4:103.151.192.0/23 ip4:104.43.243.237 ip4:149.97.173.180 ip4:163.116.128.0/17 ip4:170.10.128.0/24 ip4:170.10.129.0/24 ip4:170.10.132.56/29 ip4:170.10.132.64/29 ip4:170.10.133.0/24 ip4:18.194.95.56 ip4:18.198.96.88 include:_spf1.zendesk.com ~all
Fix: Move to -all once you have confirmed all senders are listed.
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dmarc rua
DMARC has no rua address, so you receive no aggregate reports and are flying blind.
v=DMARC1; p=reject
Fix: Add rua=mailto:dmarc@zendesk.com to the record.
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mta sts
No MTA-STS policy, so inbound mail can be downgraded to an unencrypted connection.
Fix: Publish _mta-sts.zendesk.com and host a policy at https://mta-sts.zendesk.com/.well-known/mta-sts.txt.
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mx
Mail is handled by Mimecast.
0 us-smtp-inbound-1.mimecast.com, 0 us-smtp-inbound-2.mimecast.com, 110 aspmx.l.google.com, 120 alt1.aspmx.l.google.com, 120 alt2.aspmx.l.google.com, 130 aspmx2.googlemail.com
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dmarc
DMARC is enforcing with p=reject.
v=DMARC1; p=reject
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dkim
DKIM keys found for 6 selectors.
k1._domainkey, k2._domainkey, s1._domainkey, s2._domainkey, mandrill._domainkey, hs1._domainkey
Records
| MX | 0 us-smtp-inbound-1.mimecast.com0 us-smtp-inbound-2.mimecast.com110 aspmx.l.google.com120 alt1.aspmx.l.google.com120 alt2.aspmx.l.google.com130 aspmx2.googlemail.com |
|---|---|
| SPF | v=spf1 ip4:103.151.192.0/23 ip4:104.43.243.237 ip4:149.97.173.180 ip4:163.116.128.0/17 ip4:170.10.128.0/24 ip4:170.10.129.0/24 ip4:170.10.132.56/29 ip4:170.10.132.64/29 ip4:170.10.133.0/24 ip4:18.194.95.56 ip4:18.198.96.88 include:_spf1.zendesk.com ~all |
| DMARC | v=DMARC1; p=reject |
| DKIM selectors | k1, k2, s1, s2, mandrill, hs1 |
| MTA-STS | not published |
| TLS-RPT | not published |
| BIMI | not published |
| DNSSEC | not validating |
Same data, as JSON, in one request. No SMTP probing, no stored recipient data, 250 free calls a month.
curl "https://mailgrade.dev/v1/domain?domain=zendesk.com"
Also available: /v1/verify?email=… for individual addresses, and
/v1/verify/batch for lists.