[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] t class  T configuration command  2nd  T= delivery agent equate  tabs  [See whitespace] targets, syslog.conf file and  TCP (Transmission Control Protocol)      reserved port for      TCP/IP  2nd  TCPWRAPPERS compile-time macro  telephone lines, messages sent via  TempFileMode option  temporary errors  terminal, $y macro and  test directory contents  testing     addresses      aliases  2nd      delivery agents      seteuid and setreuid routines      users with SMTP commands  text database type  Text: header line  tf file  time  [See date and time] time to live (TTL)  timeout, process wait and  Timeout.ident option  Timeout.queuereturn option  tls_client rule set  TLS_NO_RSA compile-time macro  tls_rcpt rule set  tls_server rule set  To: header line  to= equate (syslog output)  TOBUFSIZE compile-time macro  token separation operators  tokenization      of header field contents  2nd  too many named rulesets error message  trace headers  trailing dots     in aliases file      stripping  transaction delay  2nd  transfer agents (MTAs), ignoring MX records and  Transmission Control Protocol  [See TCP] transmission protocols      $r macro and  transmission protocols, setting  troubleshooting     ~/.forward file      aliases      command-line switches      companion programs for sendmail      compile-time macros      debugging      delivery agent execution      delivery to programs      DNS      handling down sites      headers      logging      mailing lists      performance      queue      rule sets      rules      security      sendmail options for      sendmail.cf configuration file  2nd  trusted users  2nd  3rd  4th  try_tls rule set  TryNullMXList (w) option  TTL (time to live)  tty device  TTYNAME compile-time macro  tuning     delivery agent equates      sendmail  2nd      syslog.conf  tutorial for sendmail, guide to