Exchange 2013 installed on Windows server 2012 standard running as a hyper-v vm.
Both Mailbox and clientaccess role is installed on the server.
Email flow was working fine and suddenly stopped working.
Now all emails sent to internal and external recipients are going in drafts folder and not getting send.
Telnet to localhost working fine and shows banner.
Mailflow releated all services running fine.
Disabled antivirus,Rebooted the server still no go.