Excellent, with 1 thing to fix

f5.com scored 92/100 (grade A). The main issue is DKIM key shorter than 2048 bits. Detected senders: Microsoft 365 and Salesforce.

Checked 2026-10-04 02:03 UTC · fresh check

6 passed1 needs attention0 failing1 for informationDetected senders: Microsoft 365, Salesforce

All checks

MXCan servers find your inbox?No issues foundPass

Nothing to report.

SPFWho may send as you?No issues foundPass

Nothing to report.

DKIMAre your emails signed?DKIM key shorter than 2048 bitsNeeds attention

Warning: DKIM key shorter than 2048 bits
selector1 (1024-bit), k1 (1024-bit), s2 (1024-bit) uses an RSA key below 2048 bits. Short keys can be factored and some receivers treat them as weak. Rotate to a 2048-bit key at your sending provider.
Pass: DKIM key published
f5.com publishes a DKIM key under selector1, selector2, k1, s1, s2.

DMARCWhat happens to fakes?No issues foundPass

Nothing to report.

AlignmentDoes it match your From?No issues foundPass

Nothing to report.

BIMICan inboxes show your logo?No BIMI recordInfo

Info: No BIMI record
No BIMI record at default._bimi.f5.com. 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?No issues foundPass

Nothing to report.

TLS-RPTWill you hear about failures?TLS-RPT is configuredPass

Pass: TLS-RPT is configured
TLS reports will be sent to mailto:tls-rpt@f5.com.

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.f5.com

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://f5.com/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.f5.com with v=BIMI1, l= set to the logo URL and a= set to the certificate URL.