For T137603, a list of domains used by Wikimedia users in their preferences that have active DMARC records is needed. To do that:
- Get a list of (unique) domains used by Wikimedia users.
- For each domain, get the DMARC record (dig +short txt _dmarc.yahoo.com); exclude domains that do not have a DMARC record.
- Exclude domains that have a p=none tag (for example .wikimedia.org or .gmail.com).
- List the remaining domains.
Ideally, this process would be done by a (maintenance) script so that it can be repeated easily.