CNAME DMARC not working

[donserdal]

Describe the bug
When checking a domain with a CNAME'd There is a Go Panic regarding

To Reproduce
Check a domain with a CNAME'd DMARC record
Can be created using: https://mxtoolbox.com/dmarc/dmarc-setup-cname

Expected behavior
DMARC report :-D

Screenshots
user@server:~$ mxcheck -n -s < REDACTED >.nl -S default

INFO: 2024/05/14 15:24:50 == Checking: < REDACTED >.nl ==
INFO: 2024/05/14 15:24:50 Found MX:
INFO: 2024/05/14 15:24:50 < REDACTED >-nl.mail.protection.outlook.com.
INFO: 2024/05/14 15:24:50 == Checking DKIM record ==
INFO: 2024/05/14 15:24:50 DKIM not set or wrong selector
INFO: 2024/05/14 15:24:50 == Checking DMARC record ==
panic: interface conversion: dns.RR is *dns.CNAME, not *dns.TXT

goroutine 1 [running]:
main.getDMARC({0x7fff3566f5fd?, 0xc0000c95d8?}, {0x70ad2f, 0x7})
/home/user/go/pkg/mod/github.com/steffenfritz/[email protected]/dns.go:245 +0x3cc
main.main()
/home/user/go/pkg/mod/github.com/steffenfritz/[email protected]/main.go:167 +0xd56

System (please complete the following information):

• OS: Ubuntu
• Version 22.04

[steffenfritz]

Hi,

the check is done against a TXT entry and not CNAME, this has to be handled and therefore I added the bug label.

However, in your report snippet I see "DKIM not set or wrong selector". Can you redo the test with the correct selector?