== Current situation ==
When somebody with any recent and "modern" mail protection (SPF, DKIM, DMARC) tries to write to Mailman of wikimedia.it, usually their email is marked as spam.
This is probably what is happening:
1. alice.it has a modern mail configuration only allowing e-mails from alice.it MX
2. alice@alice.it sends an email (`From: alice@alice.it`) to a mailing list example@wikimedia.it
3. wikimedia.it impersonates alice sending an email with `From: alice@alice.it` to all its members
4. ↑ **SPF fail**, wikimedia.it is NOT authorized to impersonate alice.it
== Wrong mitigations ==
The domain alice.it should not be configured to have a less secure configuration, just because its receivers try to impersonate alice.it.
The solution should try to just avoid to impersonate alice.it. So, the solution is in the wikimedia.it mailserver configuration, not in alice.it.
== Proposed solution ==
The mailing list wikimedia.it should only send e-mails from its own domain.