SCON, waiting queue mail does not work (no message is sent)

Hi all,

I am facing the following problem.

The waiting queue mail in SAP does not work, no message issent

All messages remains in wait mode. I checked send email in the unix he works fine

I Planned the job SAPConnect every 3 minutes, but he is running without stopping.

when I check the level SMICM Memory pipes, all buffers is occuped, but as soon when I stop the job, all bufers in SMICM are released.

Have you any idea

Thanks