Yet another solution: Keep track of candidates for our authserv-id

src/config.rs

@@ -184,6 +184,16 @@ pub enum Config {
     /// In a future versions, this switch may be removed.
     #[strum(props(default = "0"))]
     SendSyncMsgs,
+
+    /// Space-separated list of all the authserv-ids which we believe
+    /// may be the one of our email server.
+    ///
+    /// When checking DKIM and SPF, our email server adds the results in an
+    /// Authentication-Results... TODO documentation
+    ///
+    /// See https://github.com/deltachat/deltachat-core-rust/issues/3507 for more
+    /// info about the Authentication-Results header.
+    AuthservIdCandidates,
 }
 
 impl Context {