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''-U'' '''

-U
This is the initial MUA-to-MTA submission V8.8 through V8.11

The -U command-line switch is used to tell sendmail that this is the very first step in this email message's submission.

From V8.8 through V8.11, this switch did nothing. Beginning with V8.12 this switch was eliminated, and the default behavior of sendmail was changed. Now sendmail presumes that any message's submission is an initial submission unless the -G command-line switch is present.



    		Preface
    		Chapter 1. Some Basics
    		Part I: Build and Install
    		Part II: Administration
    		Chapter 6. Tune Performance
    		Chapter 7. How to Handle spam
    		Chapter 8. Test Rule Sets with -bt
    		Chapter 9. DNS and sendmail
    		Chapter 10. Maintain Security with sendmail
    		Chapter 11. Manage the Queue
    		Chapter 12. Maintain Aliases
    		Chapter 13. Mailing Lists and ~/.forward
    		Chapter 14. Signals, Transactions, and Syslog
    		Chapter 15. The sendmail Command Line
    		15.1 Alternative argv[0] Names
    		15.2 Command-Line Switches
    		15.3 List of Recipient Addresses
    		15.4 Processing the Command Line
    		15.5 sendmail's exit( ) Status
    		''EX_CANTCREAT'' '''
    		''EX_CONFIG'' '''
    		''EX_IOERR'' '''
    		''EX_OK'' '''
    		''EX_OSERR'' '''
    		''EX_OSFILE'' '''
    		''EX_SOFTWARE'' '''
    		''EX_TEMPFAIL'' '''
    		''EX_UNAVAILABLE'' '''
    		''EX_USAGE'' '''
    		15.6 Pitfalls
    		15.7 Alphabetized Command-Line Switches
    		''-A'' '''
    		''-B'' '''
    		''-b'' '''
    		''-ba'' '''
    		''-bD'' '''
    		''-bd'' '''
    		''-bH'' '''
    		''-bh'' '''
    		''-bi'' '''
    		''-bm'' '''
    		''-bP'' '''
    		''-bp'' '''
    		''-bs'' '''
    		''-bt'' '''
    		''-bv'' '''
    		''-bz'' '''
    		''-C'' '''
    		''-c'' '''
    		''-d'' '''
    		''-E'' '''
    		''-e'' '''
    		''-F'' '''
    		''-f'' '''
    		''-G'' '''
    		''-h'' '''
    		''-I'' '''
    		''-i'' '''
    		''-J'' '''
    		''-L'' '''
    		''-M'' '''
    		''-m'' '''
    		''-N'' '''
    		''-n'' '''
    		''-O'' '''
    		''-o'' '''
    		''-p'' '''
    		''-q'' '''
    		''-R'' '''
    		''-r'' '''
    		''-s'' '''
    		''-T'' '''
    		''-t'' '''
    		''-U'' '''
    		''-V'' '''
    		''-v'' '''
    		''-X'' '''
    		''-x'' '''
    		Chapter 16. Debug sendmail with -d
    		Part III: The Configuration File
    		Part IV: Appendixes
    		Bibliography