Coping With Postfix Mail Server Attacks

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Too many "smtp -t unix -u" processes

1005 ?        S      0:00 smtp -t unix -u
1006 ?        S      0:00 smtp -t unix -u
1007 ?        S      0:00 smtp -t unix -u
1008 ?        S      0:00 smtp -t unix -u
1009 ?        S      0:00 smtp -t unix -u
1010 ?        S      0:00 smtp -t unix -u
1011 ?        S      0:00 smtp -t unix -u
1012 ?        S      0:00 smtp -t unix -u
1013 ?        S      0:00 smtp -t unix -u
1014 ?        S      0:00 smtp -t unix -u
1015 ?        S      0:00 smtp -t unix -u
1016 ?        S      0:00 smtp -t unix -u
1017 ?        S      0:00 smtp -t unix -u
1018 ?        S      0:00 smtp -t unix -u
1019 ?        S      0:00 smtp -t unix -u
1020 ?        S      0:00 smtp -t unix -u
1021 ?        S      0:00 smtp -t unix -u
1022 ?        S      0:00 bounce -z -n defer -t unix -u
1023 ?        S      0:00 smtp -t unix -u
1024 ?        S      0:00 smtp -t unix -u
1025 ?        S      0:00 smtp -t unix -u
1026 ?        S      0:00 smtp -t unix -u
1027 ?        S      0:00 smtp -t unix -u
1028 ?        S      0:00 smtp -t unix -u
1030 ?        S      0:00 smtp -t unix -u
1031 ?        S      0:00 smtp -t unix -u
1032 ?        S      0:00 smtp -t unix -u
1033 ?        S      0:00 smtp -t unix -u
1034 ?        S      0:00 smtp -t unix -u
1035 ?        S      0:00 smtp -t unix -u
1036 ?        S      0:00 smtp -t unix -u
1038 ?        S      0:00 dovecot/pop3-login

Someone is attacking your email server. The server is spawning too many smtp processes and is slow or nearly not responsive.