Allow setting SPF/DKIM/DMARC to prevent mail spoofing when self hosting

[mildredboink05]

Please describe your feature request:

I self host interactsh and I would like to prevent anyone from spoofing emails from the domain that I use for interactsh. To do so, I'd like to set the following records

; SPF
example.com. IN TXT "v=spf1 -all"

; DKIM
*._domainkey.example.com. TXT "v=DKIM1; p="

; DMARC
_dmarc.example.com. IN TXT "v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s"

See the following article for more details: https://www.cloudflare.com/learning/dns/dns-records/protect-domains-without-email/

Describe the use case of this feature:

Prevent email spoofing when self hosting

[GeorginaReeder]

Thanks for your feature request @mildredboink05 , we'll take a look into this!

[dwisiswant0]

When you choose to self-host, managing DNS records falls entirely under your responsibility as the end user. From what I can see, Interactsh does not have any built-in functionality to handle or automate DNS record management for self-hosted instances. So, there doesn’t seem to be anything that can be done from Interactsh’s side to address this. Could you clarify what exactly you are proposing?

[mildredboink05]

Interactsh is acting as the nameserver for the domain when you self host, so Interactsh has to manage the DNS records. I'm proposing adding an option to set the SPF, DKIM, and DMARC records specified above. This would prevent spoofing of emails from the domain being used to self host.

Perhaps the custom-records functionality could be extended to support these additional records?