diff --git a/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/EmailsFetcher.kt b/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/EmailsFetcher.kt
index 3e52d5d..d775b09 100644
--- a/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/EmailsFetcher.kt
+++ b/e-invoice-domain/src/main/kotlin/net/codinux/invoicing/email/EmailsFetcher.kt
@@ -23,7 +23,8 @@ import java.util.concurrent.Executors
 import kotlin.math.max
 
 open class EmailsFetcher(
-    protected open val eInvoiceReader: EInvoiceReader = EInvoiceReader()
+    protected open val eInvoiceReader: EInvoiceReader = EInvoiceReader(),
+    protected open val coroutineDispatcher: CoroutineDispatcher = Executors.newFixedThreadPool(max(24, Runtime.getRuntime().availableProcessors() * 4)).asCoroutineDispatcher()
 ) {
 
     protected data class MessagePart(
@@ -32,8 +33,6 @@ open class EmailsFetcher(
     )
 
 
-    protected open val coroutineDispatcher = Executors.newFixedThreadPool(max(24, Runtime.getRuntime().availableProcessors() * 4)).asCoroutineDispatcher()
-
     protected val log by logger()