update dynamic LoginName

caddy/Dockerfile.caddy

@@ -7,7 +7,16 @@ RUN xcaddy build ${CADDY_VERSION} \
   --with github.com/caddy-dns/cloudflare \
   --with github.com/caddyserver/replace-response
 
+# Autodiscover Handler in Go bauen (Go ist im Builder-Image bereits verfügbar)
+COPY autodiscover-handler.go /src/autodiscover-handler.go
+WORKDIR /src
+RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /usr/bin/autodiscover-handler autodiscover-handler.go
+
 FROM caddy:${CADDY_VERSION}
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy
-RUN mkdir -p /var/log/caddy
+COPY --from=builder /usr/bin/autodiscover-handler /usr/local/bin/autodiscover-handler
+COPY start.sh /usr/local/bin/start.sh
+RUN chmod +x /usr/local/bin/start.sh /usr/local/bin/autodiscover-handler \
+    && mkdir -p /var/log/caddy
 
+CMD ["/usr/local/bin/start.sh"]

caddy/autodiscover-handler.go

@@ -0,0 +1,109 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"regexp"
+	"strings"
+)
+
+const port = "8280"
+
+var emailRegex = regexp.MustCompile(`(?i)<EMailAddress>([^<]+)</EMailAddress>`)
+
+func main() {
+	http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprint(w, "OK")
+	})
+
+	http.HandleFunc("/autodiscover/autodiscover.xml", handleAutodiscover)
+	// Outlook sendet manchmal mit Großbuchstaben
+	http.HandleFunc("/Autodiscover/Autodiscover.xml", handleAutodiscover)
+	http.HandleFunc("/AutoDiscover/AutoDiscover.xml", handleAutodiscover)
+
+	log.Printf("[autodiscover] Listening on port %s", port)
+	if err := http.ListenAndServe(":"+port, nil); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func handleAutodiscover(w http.ResponseWriter, r *http.Request) {
+	var email string
+
+	if r.Method == http.MethodPost {
+		body, err := io.ReadAll(r.Body)
+		if err == nil {
+			if match := emailRegex.FindStringSubmatch(string(body)); len(match) > 1 {
+				email = strings.TrimSpace(match[1])
+			}
+		}
+		r.Body.Close()
+	}
+
+	var domain string
+	if email != "" {
+		parts := strings.SplitN(email, "@", 2)
+		if len(parts) == 2 {
+			domain = parts[1]
+		}
+	}
+	if domain == "" {
+		domain = extractDomainFromHost(r.Host)
+	}
+
+	log.Printf("[autodiscover] %s from %s - email=%q domain=%s", r.Method, r.RemoteAddr, email, domain)
+
+	w.Header().Set("Content-Type", "application/xml")
+	w.WriteHeader(http.StatusOK)
+	fmt.Fprint(w, buildResponse(domain, email))
+}
+
+func extractDomainFromHost(host string) string {
+	// Strip port
+	if idx := strings.Index(host, ":"); idx >= 0 {
+		host = host[:idx]
+	}
+	parts := strings.Split(host, ".")
+	if len(parts) >= 3 && strings.EqualFold(parts[0], "autodiscover") {
+		return strings.Join(parts[1:], ".")
+	}
+	if len(parts) >= 2 {
+		return strings.Join(parts[len(parts)-2:], ".")
+	}
+	return host
+}
+
+func buildResponse(domain, loginName string) string {
+	return fmt.Sprintf(`<?xml version="1.0" encoding="utf-8"?>
+<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
+  <Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
+    <Account>
+      <AccountType>email</AccountType>
+      <Action>settings</Action>
+      <Protocol>
+        <Type>IMAP</Type>
+        <Server>imap.%s</Server>
+        <Port>993</Port>
+        <DomainRequired>off</DomainRequired>
+        <LoginName>%s</LoginName>
+        <SPA>off</SPA>
+        <SSL>on</SSL>
+        <AuthRequired>on</AuthRequired>
+      </Protocol>
+      <Protocol>
+        <Type>SMTP</Type>
+        <Server>smtp.%s</Server>
+        <Port>465</Port>
+        <DomainRequired>off</DomainRequired>
+        <LoginName>%s</LoginName>
+        <SPA>off</SPA>
+        <SSL>on</SSL>
+        <AuthRequired>on</AuthRequired>
+      </Protocol>
+    </Account>
+  </Response>
+</Autodiscover>`, domain, loginName, domain, loginName)
+}

caddy/start.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -e
+
+# Autodiscover handler im Hintergrund starten
+/usr/local/bin/autodiscover-handler &
+
+# Caddy im Vordergrund
+exec caddy run --config /etc/caddy/Caddyfile --adapter caddyfile

caddy/update-caddy-certs.sh

@@ -78,36 +78,7 @@ OUTPUT="${OUTPUT}(email_settings) {\n"
 # --- 1. Outlook Classic Autodiscover (POST + GET XML) ---
 OUTPUT="${OUTPUT}    # Outlook Autodiscover (XML) - POST und GET\n"
 OUTPUT="${OUTPUT}    route /autodiscover/autodiscover.xml {\n"
-OUTPUT="${OUTPUT}        header Content-Type \"application/xml\"\n"
+OUTPUT="${OUTPUT}      reverse_proxy localhost:8280\n"
-OUTPUT="${OUTPUT}        respond \`<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
-OUTPUT="${OUTPUT}<Autodiscover xmlns=\"http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006\">\n"
-OUTPUT="${OUTPUT}  <Response xmlns=\"http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a\">\n"
-OUTPUT="${OUTPUT}    <Account>\n"
-OUTPUT="${OUTPUT}      <AccountType>email</AccountType>\n"
-OUTPUT="${OUTPUT}      <Action>settings</Action>\n"
-OUTPUT="${OUTPUT}      <Protocol>\n"
-OUTPUT="${OUTPUT}        <Type>IMAP</Type>\n"
-OUTPUT="${OUTPUT}        <Server>imap.{labels.1}.{labels.0}</Server>\n"
-OUTPUT="${OUTPUT}        <Port>993</Port>\n"
-OUTPUT="${OUTPUT}        <DomainRequired>off</DomainRequired>\n"
-OUTPUT="${OUTPUT}        <LoginName></LoginName>\n"
-OUTPUT="${OUTPUT}        <SPA>off</SPA>\n"
-OUTPUT="${OUTPUT}        <SSL>on</SSL>\n"
-OUTPUT="${OUTPUT}        <AuthRequired>on</AuthRequired>\n"
-OUTPUT="${OUTPUT}      </Protocol>\n"
-OUTPUT="${OUTPUT}      <Protocol>\n"
-OUTPUT="${OUTPUT}        <Type>SMTP</Type>\n"
-OUTPUT="${OUTPUT}        <Server>smtp.{labels.1}.{labels.0}</Server>\n"
-OUTPUT="${OUTPUT}        <Port>465</Port>\n"
-OUTPUT="${OUTPUT}        <DomainRequired>off</DomainRequired>\n"
-OUTPUT="${OUTPUT}        <LoginName></LoginName>\n"
-OUTPUT="${OUTPUT}        <SPA>off</SPA>\n"
-OUTPUT="${OUTPUT}        <SSL>on</SSL>\n"
-OUTPUT="${OUTPUT}        <AuthRequired>on</AuthRequired>\n"
-OUTPUT="${OUTPUT}      </Protocol>\n"
-OUTPUT="${OUTPUT}    </Account>\n"
-OUTPUT="${OUTPUT}  </Response>\n"
-OUTPUT="${OUTPUT}</Autodiscover>\` 200\n"
 OUTPUT="${OUTPUT}    }\n"
 OUTPUT="${OUTPUT}\n"