diff --git a/config/mail/content.ts b/config/mail/content.ts
index 2a502f7..8d3044e 100644
--- a/config/mail/content.ts
+++ b/config/mail/content.ts
@@ -1,4 +1,8 @@
-import { Attachment, resolveAttachment } from "./attachments.ts";
+import {
+  Attachment,
+  resolveAttachment,
+  ResolvedAttachment,
+} from "./attachments.ts";
 import { quotedPrintableEncode } from "./encoding.ts";
 
 export interface Content {
@@ -8,7 +12,25 @@ export interface Content {
   relatedAttachments?: Attachment[];
 }
 
-export function resolveContent({
+export interface ResolvedContent {
+  mimeType: string;
+  content: string;
+  transferEncoding?: string;
+  relatedAttachments: ResolvedAttachment[];
+}
+
+export function resolveContent(content: Content): ResolvedContent {
+  return {
+    mimeType: content.mimeType,
+    content: content.content,
+    transferEncoding: content.transferEncoding,
+    relatedAttachments: content.relatedAttachments
+      ? content.relatedAttachments.map((v) => resolveAttachment(v))
+      : [],
+  };
+}
+
+export function resolveMessage({
   text,
   html,
   relatedAttachments,
@@ -18,8 +40,8 @@ export function resolveContent({
   html?: string;
   relatedAttachments?: Attachment[];
   mimeContent?: Content[];
-}): Content[] {
-  const newContent = [...mimeContent ?? []];
+}): ResolvedContent[] {
+  const newContent = [...mimeContent ?? []].map((v) => resolveContent(v));
 
   if (text === "auto" && html) {
     text = html
@@ -33,22 +55,17 @@ export function resolveContent({
       mimeType: 'text/plain; charset="utf-8"',
       content: quotedPrintableEncode(text),
       transferEncoding: "quoted-printable",
+      relatedAttachments: [],
     });
   }
 
   if (html) {
-    const newMime: Content = {
+    newContent.push(resolveContent({
       mimeType: 'text/html; charset="utf-8"',
       content: quotedPrintableEncode(html),
       transferEncoding: "quoted-printable",
-    };
-
-    if (relatedAttachments) {
-      newMime.relatedAttachments = relatedAttachments.map((attachment) =>
-        resolveAttachment(attachment)
-      );
-    }
-    newContent.push(newMime);
+      relatedAttachments,
+    }));
   }
 
   return newContent;
diff --git a/config/mail/mod.ts b/config/mail/mod.ts
index dd87936..a050ca5 100644
--- a/config/mail/mod.ts
+++ b/config/mail/mod.ts
@@ -3,7 +3,7 @@ import {
   resolveAttachment,
   ResolvedAttachment,
 } from "./attachments.ts";
-import { Content, resolveContent } from "./content.ts";
+import { Content, ResolvedContent, resolveMessage } from "./content.ts";
 import {
   isSingleMail,
   mailList,
@@ -49,7 +49,7 @@ export interface ResolvedSendConfig {
   from: saveMailObject;
   date: string;
   subject: string;
-  mimeContent: Content[];
+  mimeContent: ResolvedContent[];
   inReplyTo?: string;
   replyTo?: saveMailObject;
   references?: string;
@@ -86,7 +86,7 @@ export function resolveSendConfig(config: SendConfig): ResolvedSendConfig {
     bcc: parseMailList(bcc),
     from: parseSingleEmail(from),
     date,
-    mimeContent: resolveContent({
+    mimeContent: resolveMessage({
       mimeContent,
       html,
       relatedAttachments,