Hi,

one of my user receive "Server Error in '/' Application" page when he try to open webmail. 

i open error log and i can see below error. Someone please help me to resolve the issue.

I change the domain name into numbers 12345... and yes domain name is too long and we can not change it.

I am running SM version 15.7 on Windows server 2016 with IIS enabled. All other users are working fine but only receive error on this user. 

Error Log:

[CurrentUser: ingleburn@123456789123456789.com.au]
[1/16/2019 3:07:15 PM]
http://webmail.domain.com.au/Login.aspx

System.IO.PathTooLongException: The specified path, file name, or both are too long. The fully qualified file name must be less than 260 characters, and the directory name must be less than 248 characters.

Server stack trace:
   at System.IO.Path.LegacyNormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
   at System.IO.Path.InternalGetDirectoryName(String path)
   at System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler, Boolean checkHost)
   at System.IO.Directory.GetFiles(String path, String searchPattern)
   at MailStore.Mailboxes.Mailbox.Rebuild(UInt32 uidValidityValue)
   at MailStore.Mailboxes.Mailbox.Deserialize()
   at MailStore.Mailboxes.Mailbox..ctor(String rootDirectory, String name, String mmUniqueId)
   at MailStore.Mailboxes.MailboxManager.GetMailbox(String subFolderName)
   at MailStore.Utility.FolderBuilder.BuildFolderList(MailboxManager mm, Char dirsep)
   at MailService.Remoting.Mail.#OX(String #gno, String #wab)
   at MailService.Remoting.Mail.ListFolders(String session, String email, Boolean recursive)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at SmarterMail.RemoteInterface.IMail.ListFolders(String sessionStr, String emailAddress, Boolean recursive)
   at SMWeb.HelperClasses.RemoteWrapper.SessionCallWithConnection[T](UserData usr, Func`2 f)
   at SMWeb.HelperClasses.RemoteWrapper.ListFolders_Inner(UserData usr, String email, Boolean recursive)
   at SMWeb.HelperClasses.Misc.FolderCountHelper.DetectChanges(HttpSessionState session, StringBuilder sb)
   at SMWeb.HelperClasses.CustomPage.OnPreRender(EventArgs e)
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
Application Error