diff --git a/app/src/main/java/eu/faircode/email/EmailProvider.java b/app/src/main/java/eu/faircode/email/EmailProvider.java
index c8eceb25ae..00f5cc0fb8 100644
--- a/app/src/main/java/eu/faircode/email/EmailProvider.java
+++ b/app/src/main/java/eu/faircode/email/EmailProvider.java
@@ -88,6 +88,7 @@ public class EmailProvider implements Parcelable {
     public boolean partial;
     public boolean useip;
     public boolean appPassword;
+    public String maxtls;
     public String link;
     public Server imap = new Server();
     public Server smtp = new Server();
@@ -241,6 +242,7 @@ public class EmailProvider implements Parcelable {
                         provider.partial = getAttributeBooleanValue(xml, "partial", true);
                         provider.useip = getAttributeBooleanValue(xml, "useip", true);
                         provider.appPassword = getAttributeBooleanValue(xml, "appPassword", false);
+                        provider.maxtls = xml.getAttributeValue(null, "maxtls");
                         provider.link = xml.getAttributeValue(null, "link");
 
                         String documentation = xml.getAttributeValue(null, "documentation");
diff --git a/app/src/main/java/eu/faircode/email/EmailService.java b/app/src/main/java/eu/faircode/email/EmailService.java
index a63f49b222..3251fb36a8 100644
--- a/app/src/main/java/eu/faircode/email/EmailService.java
+++ b/app/src/main/java/eu/faircode/email/EmailService.java
@@ -47,6 +47,7 @@ import com.sun.mail.util.SocketConnectException;
 import com.sun.mail.util.TraceOutputStream;
 
 import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintStream;
@@ -430,7 +431,18 @@ public class EmailService implements AutoCloseable {
                 }
             }
 
-            factory = new SSLSocketFactoryService(host, insecure, ssl_harden, ssl_harden_strict, cert_strict, key, chain, fingerprint);
+            boolean strict = ssl_harden_strict;
+            if (provider != null)
+                try {
+                    EmailProvider p = EmailProvider.getProvider(context, provider);
+                    if ("1.2".equals(p.maxtls)) {
+                        strict = false;
+                        Log.i(p.name + " maxtls=" + p.maxtls);
+                    }
+                } catch (FileNotFoundException ignored) {
+                }
+
+            factory = new SSLSocketFactoryService(host, insecure, ssl_harden, strict, cert_strict, key, chain, fingerprint);
             properties.put("mail." + protocol + ".ssl.socketFactory", factory);
             properties.put("mail." + protocol + ".socketFactory.fallback", "false");
             properties.put("mail." + protocol + ".ssl.checkserveridentity", "false");
diff --git a/app/src/main/res/xml/providers.xml b/app/src/main/res/xml/providers.xml
index a4ff6dcd08..14d6932a5c 100644
--- a/app/src/main/res/xml/providers.xml
+++ b/app/src/main/res/xml/providers.xml
@@ -44,6 +44,7 @@
         name="Outlook"
         domain="outlook\\..*"
         link="https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-faq14"
+        maxtls="1.2"
         noop="true"
         order="2"
         partial="false"
@@ -61,6 +62,7 @@
         name="Live"
         domain="live\\..*"
         link="https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-faq14"
+        maxtls="1.2"
         noop="true"
         order="3"
         partial="false"
@@ -78,6 +80,7 @@
         name="Hotmail"
         domain="hotmail\\..*"
         link="https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-faq14"
+        maxtls="1.2"
         noop="true"
         order="4"
         partial="false"
@@ -94,6 +97,7 @@
     <provider
         name="MSN"
         domain="\\.msn\\..*"
+        maxtls="1.2"
         partial="false">
         <imap
             host="imap-mail.outlook.com"
@@ -110,6 +114,7 @@
         enabled="false"
         id="office365"
         link="https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-faq14"
+        maxtls="1.2"
         noop="true"
         order="5"
         partial="false"
@@ -148,6 +153,7 @@
         description="Outlook/Office 365"
         id="office365pcke"
         link="https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-faq14"
+        maxtls="1.2"
         noop="true"
         order="5"
         partial="false"
@@ -186,6 +192,7 @@
         enabled="false"
         id="outlook"
         link="https://github.com/M66B/FairEmail/blob/master/FAQ.md#user-content-faq14"
+        maxtls="1.2"
         noop="true"
         order="5"
         partial="false"
@@ -793,7 +800,8 @@
     <provider
         name="Runbox"
         domain="runbox\\..*"
-        link="https://help.runbox.com/email-program-settings/">
+        link="https://help.runbox.com/email-program-settings/"
+        maxtls="1.2">
         <imap
             host="mail.runbox.com"
             port="993"