Obtaining account ID from xmox.nl email server

9pfs · May 8, 2026, 8:26am

I have set up instances of https://xmox.nl both personally and for a friend, and need to obtain the let's encrypt account ID it is using for CAA records, but am not sure how to do so. How should I attempt to get its account ID? I'd prefer to avoid patching the email server software if at all possible. It generated the file data/acme/letsencrypt.key with a line "Note: PEM PKCS8 ECDSA private key generated for ACME provider letsencrypt by mox"`, if that helps at all.

Osiris · May 8, 2026, 9:04am

The ACME client used should store it somewhere and be able to show it to you.

I do not recognise the data/acme/letsencrypt.key path (maybe others will). What ACME client are you using? The private key itself is of no use.

Edit:
Looks like it has its own ACME client built in and looking at mox/autotls/autotls.go at main · mjl-/mox · GitHub I don't immediately see that this client actually stores the account URI anywhere.

orangepizza · May 8, 2026, 9:24am

If you have account key you can try to register it again with onlyReturnExisting parameter to get accounturi that using it.

MaxHearnden · May 8, 2026, 12:45pm

Try running mox config dnsrecords <domain> and it should suggest CAA records.

Osiris · May 8, 2026, 7:52pm

Good catch! That main.go of more than 4000 lines () indeed contains account URI stuff:

github.com/mjl-/mox

main.go

9795c4e77


      
          	var certIssuerDomainName, acmeAccountURI string
          	public := mox.Conf.Static.Listeners["public"]
          	if public.TLS != nil && public.TLS.ACME != "" {
          		acme, ok := mox.Conf.Static.ACME[public.TLS.ACME]
          		if ok && acme.Manager.Manager.Client != nil {
          			certIssuerDomainName = acme.IssuerDomainName
          			acc, err := acme.Manager.Manager.Client.GetReg(context.Background(), "")
          			c.log.Check(err, "get public acme account")
          			if err == nil {
          				acmeAccountURI = acc.URI
          			}
          		}
          	}

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Obtaining account ID from xmox.nl email server

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