DNSControl does not allow valid SRV target "."

[pro-sumer]

Describe the bug
I'm trying to set up Fastmail's recommended configuration via DNSControl and therefore use SRV records with a . as target for domain example.com:

SRV('_submission._tcp.example.com', 0, 0, 0, '.')

However, DNSControl's preview fails with this error:

2026/01/21 22:15:01 ERROR: BUNNY_DNS rejects domain example.com: srv has null target

To Reproduce
Steps to reproduce the behavior:

1. Configure an SRV record with target .
2. Run dnscontrol preview

Expected behavior
Record is considered valid, as per RFC2052:

A Target of "." means that the service is decidedly not available at this domain.

DNS Provider
Bunny DNS

Additional context
Bunny finally supports the target . as of this week (on my request).

However, DNSControl seems to always reject such targets?

https://github.com/StackExchange/dnscontrol/blob/main/pkg/rejectif/srv.go

[tlimoncelli]

Good to hear that BunnyDNS changed bad on your request!

Now that they support it, remove the restriction in the provider:

dnscontrol/providers/bunnydns/auditrecords.go

Line 14 in 8470260

a.Add("SRV", rejectif.SrvHasNullTarget) // Last verified 2024-01-02