diff --git a/src/mimemessage.cpp b/src/mimemessage.cpp
index 3eae06e..ec79503 100644
--- a/src/mimemessage.cpp
+++ b/src/mimemessage.cpp
@@ -148,20 +148,20 @@ QString MimeMessage::toString()
     return QString(out.buffer());
 }
 
-QString MimeMessage::formatAddress(EmailAddress *address, MimePart::Encoding encoding) {
-    QString result;
-    if (address->getName() != "")
+QByteArray MimeMessage::formatAddress(EmailAddress *address, MimePart::Encoding encoding) {
+    QByteArray result;
+    if (!address->getName().isEmpty())
     {
         switch (encoding)
         {
         case MimePart::Base64:
-            result.append(" =?utf-8?B?" + QByteArray().append(address->getName()).toBase64() + "?=");
+            result.append(" =?utf-8?B?" + address->getName().toLocal8Bit().toBase64() + "?=");
             break;
         case MimePart::QuotedPrintable:
-            result.append(" =?utf-8?Q?" + QuotedPrintable::encode(QByteArray().append(address->getName())).replace(' ', "_").replace(':',"=3A") + "?=");
+            result.append(" =?utf-8?Q?" + QuotedPrintable::encode(address->getName().toLocal8Bit()).toLocal8Bit().replace(' ', "_").replace(':',"=3A") + "?=");
             break;
         default:
-            result.append(" " + address->getName());
+            result.append(" ").append(address->getName().toLocal8Bit());
         }
     }
     result.append(" <" + address->getAddress() + ">");
@@ -172,17 +172,16 @@ void MimeMessage::writeToDevice(QIODevice &out) {
     /* =========== MIME HEADER ============ */
 
     /* ---------- Sender / From ----------- */
-    QString header;
+    QByteArray header;
     header.append("From:" + formatAddress(sender, hEncoding) + "\r\n");
     /* ---------------------------------- */
 
     /* ------- Recipients / To ---------- */
     header.append("To:");
-    QList<EmailAddress*>::iterator it;  int i;
-    for (i = 0, it = recipientsTo.begin(); it != recipientsTo.end(); ++it, ++i)
+    for (int i = 0; i<recipientsTo.size(); ++i)
     {
         if (i != 0) { header.append(","); }
-        header.append(formatAddress(*it, hEncoding));
+        header.append(formatAddress(recipientsTo.at(i), hEncoding));
     }
     header.append("\r\n");
     /* ---------------------------------- */
@@ -191,10 +190,10 @@ void MimeMessage::writeToDevice(QIODevice &out) {
     if (recipientsCc.size() != 0) {
         header.append("Cc:");
     }
-    for (i = 0, it = recipientsCc.begin(); it != recipientsCc.end(); ++it, ++i)
+    for (int i = 0; i<recipientsCc.size(); ++i)
     {
         if (i != 0) { header.append(","); }
-        header.append(formatAddress(*it, hEncoding));
+        header.append(formatAddress(recipientsCc.at(i), hEncoding));
     }
     if (recipientsCc.size() != 0) {
         header.append("\r\n");
@@ -208,10 +207,10 @@ void MimeMessage::writeToDevice(QIODevice &out) {
     switch (hEncoding)
     {
     case MimePart::Base64:
-        header.append("=?utf-8?B?" + QByteArray().append(subject).toBase64() + "?=");
+        header.append("=?utf-8?B?" + subject.toLocal8Bit().toBase64() + "?=");
         break;
     case MimePart::QuotedPrintable:
-        header.append("=?utf-8?Q?" + QuotedPrintable::encode(QByteArray().append(subject)).replace(' ', "_").replace(':',"=3A") + "?=");
+        header.append("=?utf-8?Q?" + QuotedPrintable::encode(subject.toLocal8Bit()).toLocal8Bit().replace(' ', "_").replace(':',"=3A") + "?=");
         break;
     default:
         header.append(subject);
@@ -221,7 +220,7 @@ void MimeMessage::writeToDevice(QIODevice &out) {
     header.append("\r\n");
     header.append("MIME-Version: 1.0\r\n");
 
-    out.write(header.toAscii());
+    out.write(header);
     content->writeToDevice(out);
 }
 
diff --git a/src/mimemessage.h b/src/mimemessage.h
index 7f7edc6..9735c6a 100644
--- a/src/mimemessage.h
+++ b/src/mimemessage.h
@@ -85,7 +85,7 @@ protected:
 
     MimePart::Encoding hEncoding;
 
-    static QString formatAddress(EmailAddress*, MimePart::Encoding);
+    static QByteArray formatAddress(EmailAddress*, MimePart::Encoding);
 
     /* [4] --- */
 
diff --git a/src/mimemultipart.cpp b/src/mimemultipart.cpp
index 8f14144..c5086a4 100644
--- a/src/mimemultipart.cpp
+++ b/src/mimemultipart.cpp
@@ -60,13 +60,13 @@ void MimeMultiPart::writeContent(QIODevice &device) {
     content = "";
     for (it = parts.begin(); it != parts.end(); it++) {
         device.write("--" );
-        device.write(cBoundary.toAscii());
+        device.write(cBoundary.toLatin1());
         device.write("\r\n");
         (*it)->writeToDevice(device);
     };
 
     device.write("--");
-    device.write(cBoundary.toAscii());
+    device.write(cBoundary.toLatin1());
     device.write("--\r\n");
 }
 
diff --git a/src/mimepart.cpp b/src/mimepart.cpp
index 1e85da9..58d1f5b 100644
--- a/src/mimepart.cpp
+++ b/src/mimepart.cpp
@@ -191,7 +191,7 @@ void MimePart::writeToDevice(QIODevice &device) {
 
     /* === End of Header Prepare === */
 
-    device.write(header.toAscii());
+    device.write(header.toLatin1());
 
     writeContent(device);
 }
diff --git a/src/mimeqpencoder.cpp b/src/mimeqpencoder.cpp
index 5d7e89e..20670c9 100644
--- a/src/mimeqpencoder.cpp
+++ b/src/mimeqpencoder.cpp
@@ -4,5 +4,5 @@
 MimeQpEncoder::MimeQpEncoder() {}
 
 QByteArray MimeQpEncoder::encode(const QByteArray &data) {
-    return QuotedPrintable::encode(data).toAscii();
+    return QuotedPrintable::encode(data).toLatin1();
 }
diff --git a/src/mimetext.cpp b/src/mimetext.cpp
index 338cf1e..288c6b9 100644
--- a/src/mimetext.cpp
+++ b/src/mimetext.cpp
@@ -51,7 +51,7 @@ const QString & MimeText::getText() const
 /* [3] Protected Methods */
 
 void MimeText::writeContent(QIODevice &device) {
-    this->content = text.toAscii();
+    this->content = text.toLocal8Bit();
     MimePart::writeContent(device);
 }