System malloc out of memory

Code:

service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0600
    user = vmail
  }
  user = root
}
service imap {
vsz_limit = 512MB
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
   group = postfix
   mode = 0600
   user = postfix
  }
}
lmtp_rcpt_check_quota = yes
service imap-login {
  client_limit = 1000
  process_limit = 512
}

 

Thats first thing what i did, when search fix for this problem
When it didnt fix my problem i wrote theme here

 

I fumbled again and wrote imap instead of lmtp :-D Thank you for correcting my mistake @till

 

@till, @pyte, and all thanks for help, it was realy easy problem, but not for me .D