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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