diff --git a/SECURITY.md b/SECURITY.md
index 2a1065c..7e5394c 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -4,10 +4,10 @@
 
 We provide security updates currently for these version.
 
-| Version | Supported                           |
-| ------- | ----------------------------------- |
-| 1.x     | :white_check_mark:                  |
-| 0.x     | :white_check_mark: (until 31.07.21) |
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.x     | :white_check_mark: |
+| 0.x     | :x:                |
 
 We will provide security updates after 1.0 only for the latest version of that
 major. We will deprecate major versions so you should always upgrade! Note that
diff --git a/config/mail/email.ts b/config/mail/email.ts
index e1dfc6a..fdc6976 100644
--- a/config/mail/email.ts
+++ b/config/mail/email.ts
@@ -1,3 +1,5 @@
+import { quotedPrintableEncodeInline } from "./encoding.ts";
+
 export interface mailObject {
   mail: string;
   name?: string;
@@ -23,7 +25,7 @@ export function parseSingleEmail(mail: singleMail): saveMailObject {
   if (typeof mail !== "string") {
     return {
       mail: mail.mail,
-      name: mail.name ?? "",
+      name: quotedPrintableEncodeInline(mail.name ?? ""),
     };
   }
 
@@ -41,7 +43,7 @@ export function parseSingleEmail(mail: singleMail): saveMailObject {
   const [_, name, email] = res;
 
   return {
-    name: name.trim(),
+    name: quotedPrintableEncodeInline(name.trim()),
     mail: email.trim(),
   };
 }
@@ -53,12 +55,12 @@ export function parseMailList(list: mailList): saveMailObject[] {
   if ("mail" in list) {
     return [{
       mail: list.mail,
-      name: list.name ?? "",
+      name: quotedPrintableEncodeInline(list.name ?? ""),
     }];
   }
 
   return Object.entries(list as mailListObject).map(([name, mail]) => ({
-    name,
+    name: quotedPrintableEncodeInline(name),
     mail,
   }));
 }
diff --git a/config/mail/encoding.ts b/config/mail/encoding.ts
index 6883114..e208d32 100644
--- a/config/mail/encoding.ts
+++ b/config/mail/encoding.ts
@@ -68,3 +68,16 @@ export function quotedPrintableEncode(data: string, encLB = false) {
 
   return ret;
 }
+
+function hasNonAsciiCharacters(str: string) {
+  // deno-lint-ignore no-control-regex
+  return /[^\u0000-\u007f]/.test(str);
+}
+
+export function quotedPrintableEncodeInline(data: string) {
+  if (hasNonAsciiCharacters(data)) {
+    return `=?utf-8?Q?${quotedPrintableEncode(data)}?=`;
+  }
+
+  return data;
+}
diff --git a/config/mail/mod.ts b/config/mail/mod.ts
index 41ed58d..80ad9b5 100644
--- a/config/mail/mod.ts
+++ b/config/mail/mod.ts
@@ -14,6 +14,7 @@ import {
 } from "./email.ts";
 import { ResolvedClientOptions } from "../client.ts";
 import { Headers, validateHeaders } from "./headers.ts";
+import { quotedPrintableEncodeInline } from "./encoding.ts";
 /**
  * Config for a mail
  */
@@ -90,7 +91,7 @@ export function resolveSendConfig(config: SendConfig): ResolvedSendConfig {
     }),
     replyTo: replyTo ? parseSingleEmail(replyTo) : undefined,
     inReplyTo,
-    subject,
+    subject: quotedPrintableEncodeInline(subject),
     attachments: attachments
       ? attachments.map((attachment) => resolveAttachment(attachment))
       : [],