feat(mail): new parameter to disable S/MIME certificates

SoObjects/SOGo/SOGoDefaults.plist

@@ -115,6 +115,7 @@
     SOGoMailComposeMessageType = "html";
     SOGoMailComposeFontSize = "0";
     SOGoMailDisplayRemoteInlineImages = "never";
+    SOGoMailCertificateEnabled = YES;
 
     SOGoMailAutoSave = "5";
 

SoObjects/SOGo/SOGoDomainDefaults.h

@@ -66,6 +66,7 @@
 - (BOOL) mailKeepDraftsAfterSend;
 - (BOOL) mailAttachTextDocumentsInline;
 - (NSArray *) mailListViewColumnsOrder;
+- (BOOL) mailCertificateEnabled;
 
 - (BOOL) aclSendEMailNotifications;
 - (BOOL) appointmentSendEMailNotifications;

SoObjects/SOGo/SOGoDomainDefaults.m

@@ -322,6 +322,11 @@
   return [self stringArrayForKey: @"SOGoMailListViewColumnsOrder"];
 }
 
+- (BOOL) mailCertificateEnabled
+{
+  return [self boolForKey: @"SOGoMailCertificateEnabled"];
+}
+
 - (NSArray *) superUsernames
 {
   return [self stringArrayForKey: @"SOGoSuperUsernames"];