[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Z] i delivery agent flag  I delivery agent flag  I line (qf file)  I/O error  I= queue-group equate  IDA sendmail  identification headers  identifier     envelope (ENVID), DSN  2nd      message      queue  [See queue identifier]     rule set      vendor  identity     default user      system  IDENTPROTO compile-time macro  IgnoreDots option  2nd  ignoring illegal switches  implicit database-map type  In-Reply-To: header line  INCDIRS, -I Build switch  include directory contents  Infinite loop in ruleset error message  initializing     alias databases      environment variables      macros  inode numbers  InputMailFilters option  INSTALL file  installing sendmail  internal class macros  internal mailing lists  intervals, queue processing  intvl= equate (syslog output)  invalid ruleset name error message  IP source-routing  IP_SRCROUTE compile-time macro