chewy.com
2 of 3 core checks pass. Fix the items below in order.
4 of 8 checks pass · 5 tools visible in DNS · nothing urgent
1 · Authentication and transport
SPF
ReviewValid, but "all" is openThe record ends with +all or ?all, so it does not actually restrict anyone.
v=spf1 redirect=6qfmpgd2._spf._d.mim.ec
DKIM
Pass5 keys foundSelectors selector1, selector2, k1, s1, s2 publish a public key. 5 of them point at a vendor by CNAME.
selector1._domainkey, selector2._domainkey, k1._domainkey, s1._domainkey, s2._domainkey
DMARC
PassEnforced (p=reject)Failing mail is rejected. This is the finish line.
v=DMARC1; p=reject; rua=mailto:21fb0c838604714@rep.dmarcanalyzer.com, mailto:avzUh0JRhH@dmarc.inboxmonster.com; ruf=mailto:21fb0c838604714@for.dmarcanalyzer.com; fo=1;
MX
Pass2 hostsMore than one receiving server, so a single outage does not bounce mail.
10 us-smtp-inbound-1.mimecast.com 20 us-smtp-inbound-2.mimecast.com
MTA-STS
ReviewNot publishedSending servers cannot tell that this domain requires TLS, so inbound mail can be downgraded to plain text by anyone on the path.
TLS-RPT
OptionalNot publishedNobody is told when TLS to this domain fails. Cheap to add once MTA-STS is in place.
BIMI
PassPublishedLogo record found and DMARC qualifies. Yahoo shows it from the record; Gmail and Apple Mail also need a VMC or CMC certificate (the a= tag).
v=BIMI1;l=https://vmc.digicert.com/00e51a92-eac6-49dd-a5d6-1222233fa3f5.svg;a=https://vmc.digicert.com/00e51a92-eac6-49dd-a5d6-1222233fa3f5.pem
DNSSEC
OptionalNot signedOptional. Signing the zone protects every record in this report from tampering.
2 · Tools visible in DNS
| Layer | Tool | Evidence |
|---|---|---|
| Mailbox | Microsoft 365 | DKIM selector1._domainkey → selector1-chewy-com._domainkey.chewycomllc.onmicrosoft.com |
| Gateway | Mimecast | MX us-smtp-inbound-1.mimecast.com |
| Marketing | Mailchimp | DKIM k1._domainkey → dkim.mcsv.net |
| Transactional | SendGrid | DKIM s1._domainkey → s1.domainkey.u266386.wl137.sendgrid.net |
| DMARC reporting | Mimecast DMARC Analyzer | DMARC rua=mailto:…@rep.dmarcanalyzer.com |
Only tools that leave a DNS trace appear. A shared DKIM selector is attributed only when its CNAME target names the vendor.
3 · Sender requirements (Google, Yahoo, Microsoft)
| Requirement | Applies to | Status | Note |
|---|---|---|---|
| Authenticate with SPF or DKIM | GoogleYahooMicrosoft | Verified | At least one method is in place. |
| Bulk senders: both SPF and DKIM | GoogleYahoo | Verified | Both are present. |
| Publish a DMARC record (p=none is enough) | GoogleYahooMicrosoft | Verified | Policy is p=reject. |
| From: domain aligns with SPF or DKIM | GoogleYahooMicrosoft | Not checkable here | Needs a real message. The Send-a-Test report will check this. |
| Valid forward and reverse DNS for sending IPs | GoogleYahoo | Not checkable here | Depends on the sending server, not the domain. |
| Encrypt in transit (TLS) | GoogleYahoo | Not checkable here | Outbound TLS depends on your sending tool; MTA-STS would cover inbound. |
| One-click unsubscribe (RFC 8058) for marketing mail | GoogleYahoo | Not checkable here | A message header, not a DNS record. Microsoft recommends it rather than requiring it. |
| Spam complaint rate under 0.1% (0.3% is the hard limit) | GoogleYahoo | Not checkable here | Read it in Google Postmaster Tools and Yahoo Sender Hub. Google’s target is 0.1%; 0.3% is where enforcement starts. |
4 · What to fix, in order
-
P3
Publish MTA-STS (record and policy file)
Tells sending servers to require TLS to your MX hosts, which prevents downgrade attacks. The TXT record alone does nothing: the policy file must be served over HTTPS at mta-sts.chewy.com. Start in testing mode, watch TLS-RPT, then switch to enforce.
Publish at_mta-sts.chewy.com and https://mta-sts.chewy.com/.well-known/mta-sts.txtTXT v=STSv1; id=2026100401 mta-sts.txt: version: STSv1 mode: testing mx: us-smtp-inbound-1.mimecast.com mx: us-smtp-inbound-2.mimecast.com max_age: 86400
-
P3
Publish TLS-RPT
You get a report when TLS delivery to your domain fails; this is what notices a downgrade that MTA-STS is meant to prevent. The address must exist.
Publish at_smtp._tls.chewy.comv=TLSRPTv1; rua=mailto:tls-rpt@chewy.com
-
P3
Sign the zone with DNSSEC
Protects every record in this report from being swapped in transit. Two steps: enable signing at your DNS host (one switch at Cloudflare and most others), then add the DS record it gives you at your registrar.
Publish atchewy.com
Appendix · Raw DNS answers
| Name | Type | Answer |
|---|---|---|
| chewy.com | MX | 10 us-smtp-inbound-1.mimecast.com 20 us-smtp-inbound-2.mimecast.com |
| chewy.com | A | 23.222.30.134 |
| chewy.com | TXT | v=spf1 redirect=6qfmpgd2._spf._d.mim.ec (+ 41 other TXT records: site-verification tokens and the like, omitted) |
| _dmarc.chewy.com | TXT | v=DMARC1; p=reject; rua=mailto:21fb0c838604714@rep.dmarcanalyzer.com, mailto:avzUh0JRhH@dmarc.inboxmonster.com; ruf=mailto:21fb0c838604714@for.dmarcanalyzer.com; fo=1; |
| <selector>._domainkey.chewy.com | TXT | selector1 → CNAME selector1-chewy-com._domainkey.chewycomllc.onmicrosoft.com selector2 → CNAME selector2-chewy-com._domainkey.chewycomllc.onmicrosoft.com k1 → CNAME dkim.mcsv.net s1 → CNAME s1.domainkey.u266386.wl137.sendgrid.net s2 → CNAME s2.domainkey.u266386.wl137.sendgrid.net |
| _mta-sts.chewy.com | TXT | no record |
| _smtp._tls.chewy.com | TXT | no record |
| default._bimi.chewy.com | TXT | v=BIMI1;l=https://vmc.digicert.com/00e51a92-eac6-49dd-a5d6-1222233fa3f5.svg;a=https://vmc.digicert.com/00e51a92-eac6-49dd-a5d6-1222233fa3f5.pem |