onet.pl
Good, with 1 thing to fix
onet.pl scored 88/100 (grade B). The main issue is no DKIM key found for the common selectors. Detected senders: Amazon SES.
Checked 2026-10-04 02:20 UTC · fresh check
All checks
MXCan servers find your inbox?Only one MX hostInfo
- Info: Only one MX host
All mail for onet.pl goes to mx.poczta.onet.pl. Most hosted providers make that one name highly available; if you run your own server, consider a backup MX.
SPFWho may send as you?No issues foundPass
Nothing to report.
DKIMAre your emails signed?No DKIM key found for the common selectorsNeeds attention
- Warning: No DKIM key found for the common selectors
None of the 47 selectors probed under onet.pl publish a DKIM key. DNS cannot list selectors, so a key under a custom selector may exist: find the s= value in the DKIM-Signature header of a message you sent and check that selector. If DKIM is not set up, enable it at each service that sends mail for onet.pl.
DMARCWhat happens to fakes?DMARC policy is quarantine; consider rejectInfo
- Info: DMARC policy is quarantine; consider reject
Failing mail goes to spam rather than being refused. When reports show no legitimate failures, reject gives the strongest protection.
How to fix this
AlignmentDoes it match your From?SPF alignment depends on a custom Return-PathInfo
- Info: SPF alignment depends on a custom Return-Path
This is a heuristic. Your SPF record only authorizes third-party senders (amazonses.com). By default they bounce from their own Return-Path domain, and SPF then passes for that domain, not onet.pl. Even relaxed alignment needs the Return-Path's organizational domain to be onet.pl, so set up a custom Return-Path (bounce) domain under onet.pl with each provider, and sign with DKIM as onet.pl.
BIMICan inboxes show your logo?No BIMI recordInfo
- Info: No BIMI record
No BIMI record at default._bimi.onet.pl. BIMI is optional: it shows your logo next to your mail in supporting inboxes once DMARC is enforced.
How to fix this
MTA-STSIs mail to you encrypted?MTA-STS is in testing modeInfo
- Info: MTA-STS is in testing mode
Senders report TLS failures (with TLS-RPT) but still deliver. Switch to mode: enforce once the reports are clean.
TLS-RPTWill you hear about failures?TLS-RPT is configuredPass
- Pass: TLS-RPT is configured
TLS reports will be sent to https://reporting.onet.pl/v1/tlsrpt, mailto:dfe19035@in.mailhardener.com.
How to fix it
Strengthen the DMARC policyTXT
Rejects mail that fails DMARC, the strongest protection against spoofing. Changes: Subdomains move one step, from sp=quarantine to the domain policy (p=reject).
_dmarc.onet.pl
Some DNS providers want just “_dmarc” here.
v=DMARC1; p=reject; rua=mailto:dfe19035@in.mailhardener.com,mailto:dmarc-reports@onet.pl; adkim=r; aspf=r
v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:dfe19035@in.mailhardener.com,mailto:dmarc-reports@onet.pl; ruf=mailto:dfe19035@in.mailhardener.com,mailto:dmarc-reports@onet.pl
Enable DKIM for Amazon SESinstruction
Amazon SES generates the DKIM key for each account, so the exact record must come from Amazon SES. Without DKIM, mail it sends for onet.pl cannot pass DMARC through DKIM.
Applies to: _domainkey.onet.pl
- In Amazon SES, enable DKIM signing for onet.pl: account-specific: copy the CNAME/TXT from the Amazon SES dashboard. Publish exactly the record Amazon SES shows (TXT or CNAME) at the host name it gives, then turn signing on. Instructions: https://docs.aws.amazon.com/ses/latest/dg/send-email-authentication-dkim-easy.html
Prepare BIMIinstruction
BIMI shows your logo next to messages in supporting inboxes, but only for mail that passes DMARC under an enforced policy.
Applies to: default._bimi.onet.pl
- Enforce DMARC first: p=quarantine or p=reject at 100% (no pct below 100). 2. Convert your logo to an SVG Tiny PS file and host it over HTTPS, for example https://onet.pl/bimi/logo.svg. 3. For Gmail and Apple Mail, obtain a VMC or CMC certificate for the logo. 4. Publish a TXT record at default._bimi.onet.pl with v=BIMI1, l= set to the logo URL and a= set to the certificate URL.