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What is the process `sendmail`?

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http://unix.stackexchange.com – When I type top commond, I see many sendmail, what are these sendmail? I never set mail in my service. SER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 16110 root 17 0 234m 35m 8380 R 45.3 1.7 0:02.53 php 16101 root 17 0 230m 31m 8100 R 43.3 1.5 0:02.06 php 16092 root 15 0 219m 20m 8100 S 21.0 1.0 0:01.32 php 16104 root 15 0 226m 26m 8096 S 13.6 1.3 0:01.64 php 16107 root 16 0 215m 16m 8080 R 5.3 0.8 0:00.21 php 16096 root 15 0 216m 18m 8088 S 2.7 0.9 0:00.71 php 16122 smmsp 18 0 76032 4380 2904 S 1 (HowTos)