SRV 0 0 0 .

[bwbroersma]

Currently the 0 1 port . is used:

mox/mox-/admin.go

Lines 936 to 943 in 68c130f

	// ../rfc/6186:242
	"; Next records specify POP3 and non-TLS ports are not to be used.",
	"; These are optional and safe to leave out (e.g. if you have to click a lot in a",
	"; DNS admin web interface).",
	fmt.Sprintf(`_imap._tcp.%s. SRV 0 1 143 .`, d),
	fmt.Sprintf(`_submission._tcp.%s. SRV 0 1 587 .`, d),
	fmt.Sprintf(`_pop3._tcp.%s. SRV 0 1 110 .`, d),
	fmt.Sprintf(`_pop3s._tcp.%s. SRV 0 1 995 .`, d),

Instead of 0 0 0 ., like in the RFC examples of RFC 2782 or RFC 6186.

Is there any reason to include the port number and pick a weight of 1?
Note this RFC 2782 quote about the weight selection:

Domain administrators SHOULD use Weight 0 when there isn't any server selection to do, to make the RR easier to read for humans (less noisy).

BTW cool you already implemented these records, I was researching it for:

• Detect non-websites (e.g. mailservers) in website test internetstandards/Internet.nl#1538

[mjl-]

Excellent, thanks! I don't think I had a reason for not using weight 0. I wouldn't be surprised if I never looked at RFC 2782...