diff --git a/tine20/Felamimail/css/Felamimail.css b/tine20/Felamimail/css/Felamimail.css
index a7d47a0b43..ea34aa0aae 100644
--- a/tine20/Felamimail/css/Felamimail.css
+++ b/tine20/Felamimail/css/Felamimail.css
@@ -152,7 +152,7 @@
 .preview-panel-felamimail-headers {
     background-color: #dddddd;
     overflow: auto;
-    padding: 5px;
+    padding: 10px;
 }
 
 .preview-panel-felamimail-header-row {
@@ -162,7 +162,7 @@
 
 .preview-panel-felamimail-header-row-left {
     font-weight: bold;
-    min-width: 50px;
+    min-width: 60px;
     text-align: right;
 }
 
diff --git a/tine20/Felamimail/js/MailDetailsPanel.js b/tine20/Felamimail/js/MailDetailsPanel.js
index 29f3f98f84..a6548a5b00 100644
--- a/tine20/Felamimail/js/MailDetailsPanel.js
+++ b/tine20/Felamimail/js/MailDetailsPanel.js
@@ -224,8 +224,9 @@ Ext.extend(Tine.Felamimail.MailDetailsPanel, Ext.Panel, {
                 },
                 showInfo(values) {
                     const app = Tine.Tinebase.appMgr.get('Felamimail');
-                    const items = ['subject', 'date', 'from', 'to', 'cc', 'bcc', 'extra'];
+                    const items = ['subject', 'date', 'from', 'to', 'reply-to', 'cc', 'bcc', 'extra'];
                     const headerBlock =  document.createElement('div');
+
                     headerBlock.className = 'preview-panel-felamimail-headers';
                     items.forEach((header) => {
                         let value = '';
@@ -235,9 +236,12 @@ Ext.extend(Tine.Felamimail.MailDetailsPanel, Ext.Panel, {
                         if (header === 'date') value = this.showDate(values.sent, values);
                         if (header === 'extra') headerValue = this.panel.showExtraHeaderButton();
 
-                        if (['to', 'cc', 'bcc'].includes(header)) {
+                        if (['to', 'reply-to', 'cc', 'bcc'].includes(header)) {
                             if (!values.headers.hasOwnProperty(header)) return;
-                            const emails = this.panel.record.get(header);
+                            let emails = this.panel.record.get(header) || values.headers[header];
+                            if (typeof emails === 'string') {
+                                emails = emails.split(/[,;]\s*/).map((email) => {return {email: email};});
+                            }
                             if (emails.length === 0) return;
                             //TODO: bcc only store email in \Zend_Mail::addBcc($email), do we want to change it ?
                             emails.forEach((emailData, idx) => {
@@ -653,17 +657,18 @@ Ext.extend(Tine.Felamimail.MailDetailsPanel, Ext.Panel, {
     renderHeaderRaw(header, value) {
         const row =  document.createElement('div');
         row.style.display = 'flex';
-        row.style.margin = '5px';
+        row.style.flexDirection = 'row';
+        row.style.margin = '5px 0';
         row.style.textAlign = 'left';
         const rowLeft = document.createElement('div');
         rowLeft.textContent = header;
-        rowLeft.style.minWidth = '60px';
+        rowLeft.style.minWidth = '100px';
         const rowRight =  document.createElement('div');
         rowRight.innerHTML = value;
 
-        if (header.length > 10 || value.length > 50) {
+        if (header.length > 15) {
             row.style.flexDirection = 'column';
-            rowRight.style.paddingLeft = '55px';
+            rowRight.style.paddingLeft = '100px';
         }
         row.appendChild(rowLeft);
         row.appendChild(rowRight);
diff --git a/tine20/Felamimail/js/MessageEditDialog.js b/tine20/Felamimail/js/MessageEditDialog.js
index 8122ffbb32..92023ea77d 100644
--- a/tine20/Felamimail/js/MessageEditDialog.js
+++ b/tine20/Felamimail/js/MessageEditDialog.js
@@ -889,6 +889,8 @@ Tine.Felamimail.MessageEditDialog = Ext.extend(Tine.widgets.dialog.EditDialog, {
         const replyToName = this.replyTo.get('from_name');
         const replyToToken = this.replyTo.get('from')?.[0];
 
+        // reply-to header has the highest priority
+        if (replyToHeader) return replyToHeader;
         // we might get the recipient token from server
         if (replyToToken && replyToToken?.email) return this.replyTo.get('from');
         if (replyToEmail) {
@@ -901,9 +903,7 @@ Tine.Felamimail.MessageEditDialog = Ext.extend(Tine.widgets.dialog.EditDialog, {
                 'contact_record': ''
             }];
         }
-        if (replyToHeader) {
-            return [replyToHeader];
-        }
+
 
         return [];
     },
diff --git a/tine20/Felamimail/js/RecipientGrid.js b/tine20/Felamimail/js/RecipientGrid.js
index 377fd57c5d..a60dccdf0d 100644
--- a/tine20/Felamimail/js/RecipientGrid.js
+++ b/tine20/Felamimail/js/RecipientGrid.js
@@ -724,6 +724,17 @@ Tine.Felamimail.RecipientGrid = Ext.extend(Ext.grid.EditorGridPanel, {
         ['to', 'cc', 'bcc'].forEach((type) => {
             const promise = new Promise(async (resolve) => {
                 let contacts = this.record.data[type];
+
+                await Promise.all(contacts.map(async (contact) => {
+                    if (_.isString(contact) && (contact.includes(',') || contact.includes(';'))) {
+                        return await Tine.Tinebase.common.findContactsByEmailString(contact);
+                    } else {
+                        return contact;
+                    }
+                })).then((result) => {
+                    contacts = result.flat();
+                });
+
                 let emails = _.filter(contacts, (addressData) => {return _.isString(addressData)});
                 if (emails.length > 0) {
                     emails = _.join(emails, ', ');
diff --git a/tine20/Felamimail/translations/de.po b/tine20/Felamimail/translations/de.po
index d0762b56a6..bddfd6be79 100644
--- a/tine20/Felamimail/translations/de.po
+++ b/tine20/Felamimail/translations/de.po
@@ -392,6 +392,9 @@ msgstr "Format beibehalten"
 msgid "Reply-To"
 msgstr "Antwortadresse"
 
+msgid "Reply-to"
+msgstr "Antwort an"
+
 #: Model/Account.php:312
 msgid "E-Mail"
 msgstr "E-Mail"