diff --git a/mailsystem/roundcube.nix b/mailsystem/roundcube.nix
index 1960785..ba04636 100644
--- a/mailsystem/roundcube.nix
+++ b/mailsystem/roundcube.nix
@@ -32,8 +32,9 @@ in {
       hostName = roundcubeCfg.hostName;
       plugins = ["managesieve" "password"];
       extraConfig = ''
-        // Use starttls for authentication
-        $config['smtp_host'] = "tls://${cfg.fqdn}";
+        // Use implicitly encrypted communications for imap and imap (implicit tls)
+        $config['imap_host'] = "ssl://${cfg.fqdn}";
+        $config['smtp_host'] = "ssl://${cfg.fqdn}";
         $config['smtp_user'] = "%u";
         $config['smtp_pass'] = "%p";