# Fix email authentication for ebay.com

You are working on the DNS and mail configuration for ebay.com.
Measured by MailAuthWatch on 17 Oct 2026 from public DNS. Grade A (100/100).
Report: https://www.mailauthwatch.com/check/ebay.com

## What is published right now (do not assume anything else)
- SPF (TXT ebay.com): v=spf1 include:c._spf.ebay.com include:p._spf.ebay.com include:p2._spf.ebay.com ~all   — valid, 10 of 10 lookups
- DMARC (TXT _dmarc.ebay.com): v=DMARC1; p=reject; rua=mailto:ebay@rua.agari.com; ruf=mailto:ebay@ruf.agari.com; fo=1; rf=afrf; pct=100
- DKIM: google._domainkey (1024-bit), k1._domainkey (1024-bit), s1._domainkey (2048-bit), s2._domainkey (1024-bit), dkim._domainkey (1024-bit), mandrill._domainkey (1024-bit), mte1._domainkey (2048-bit), mte2._domainkey (2048-bit), m1._domainkey (1024-bit), smtpapi._domainkey (1024-bit), dk._domainkey (1024-bit)
- MX: mx1.hc2186-24.iphmx.com, mx2.hc2186-24.iphmx.com  → a custom mail host
- Nameservers: dns1.p06.nsone.net, dns2.p06.nsone.net …  → DNS host not recognised

## Tasks, in order of impact
### 1. 8 DKIM keys are 1024-bit.
Why: Selectors google._domainkey, k1._domainkey, s2._domainkey, dkim._domainkey, mandrill._domainkey, m1._domainkey, smtpapi._domainkey, dk._domainkey are under 2048 bits, which some receivers already downgrade. 
Rotate to a 2048-bit key at the sending service.

### 2. SPF uses 10 of 10 lookups. One more include breaks it.
Why: Nothing is failing yet. This is the warning you want before it does.
Trim an unused include now, or monitor so the next addition is caught the same day.

## Rules
- Publish exactly one SPF record; never add a second v=spf1 TXT.
- Do not remove any include: or ip4: you cannot account for; mail may depend on it.
- Do not set DMARC to p=reject in one step; stage through p=none → quarantine → reject.
- Show the planned DNS changes as a diff (record, old value, new value) before applying them.
- If you cannot access the DNS provider, stop and say exactly what access you need.

## Verify
  dig +short TXT ebay.com
  dig +short TXT _dmarc.ebay.com
Then open https://www.mailauthwatch.com/check/ebay.com?fresh=1 and confirm:
  the grade is unchanged and no new issues appear. Target grade: A.

## Report back
List each record you changed (name, type, old value, new value), what you verified, and anything you could not do.