You have configured the system to send emails according to SAP Note 455140, and it is generating email messages on many clients and you can see those email requests on SOST queue.
Some emails are never dispatched and keep in waiting status.
SAP NetWeaver Application Server
RSCONN01, Client dependent, Waiting, Email, Message, Stuck, SO013, queue, XS817, XS816, XS042, SO00, SO01, SCOT, SOST, SAPConnect, SAP Connect, SEND , KBA , BC-SRV-COM , Communication Services: Mail, Fax, SMS, Telephony , Problem
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