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Today all of a sudden since last 3 hours no users could do send & receive mails using mail clients & also web interface was not working, everything was normal on server, we've restarted server & also restarted SM service than almost after 30mins thing went normal
Error received on Web interface
"No connection could be made because the target machine actively refused it 127.0.0.1:17001"
Error received while sending mails using mail clients
451 Requested action aborted: error in processing
Issue resolved on it's own & that's worrisome as we still don't know root cause of issue
using SM 11.x Entp edition