added IMAP, LetsEncrypt, update layout

internal/mailstore/rspamd.go

@@ -0,0 +1,35 @@
+package mailstore
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"time"
+)
+
+// CheckRspamd sends a message to an optional rspamd instance for scoring, only called
+// when [Rspamd] enabled=true — the built-in SpamScore heuristic (spam.go) always runs
+// regardless, so this is additive, not a replacement.
+func CheckRspamd(url string, raw []byte, mailFrom, rcptTo string) (score float64, action string, err error) {
+	req, err := http.NewRequest(http.MethodPost, url+"/checkv2", bytes.NewReader(raw))
+	if err != nil {
+		return 0, "", err
+	}
+	req.Header.Set("From", mailFrom)
+	req.Header.Set("Rcpt", rcptTo)
+	client := &http.Client{Timeout: 10 * time.Second}
+	resp, err := client.Do(req)
+	if err != nil {
+		return 0, "", err
+	}
+	defer resp.Body.Close()
+
+	var result struct {
+		Score  float64 `json:"score"`
+		Action string  `json:"action"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return 0, "", err
+	}
+	return result.Score, result.Action, nil
+}