dispatcher error....

hi there...i get these dispatcher error....can someone tell me what it means?

15:57:02.74 (3): app_create_proc(SMTP): too many processes for this

service (20 Current + 0 Pending + 10 Shutting down >= 30

Maximum)

15:57:19.83 (3): app_create_proc(SMTP): too many processes for this

service (20 Current + 1 Pending + 9 Shutting down >= 30

Maximum)

15:57:30.12 (3): app_create_proc(SMTP): too many processes for this

service (20 Current + 1 Pending + 9 Shutting down >= 30

Maximum)

15:57:41.76 (3): app_create_proc(SMTP): too many processes for this

service (21 Current + 1 Pending + 8 Shutting down >= 30

iPlanet Messaging Server 5.2 HotFix 1.21

[733 byte] By [dorifutu] at [2007-11-26 9:00:49]