sendmail, 4th Edition
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u delivery agent flag U delivery agent flag U= delivery agent equate 2nd 3rd UDB_DEFAULT_SPEC compile-time macro uid ( user -id) assume specified running agent as UIUC IDA sendmail unavailable resource error message Unbalanced warning undeliverable addresses in aliases uniformity Unix mailbox file UnixFromLine option unknown configuration line warning message unknown local users unknown mailer error message unqualified names 2nd upgrading sendmail uppercase [See case sensitivity] use_ct_file feature use_cw_file feature USE_DOUBLE_FORK compile-time macro USE_ENVIRON compile-time macro USE_VENDOR_CF_PATH compile-time macro usenet delivery agent User Database rewriting addresses and 2nd User Database key user database type user names case sensitivity and of recipients User unknown error message user-id (uid) assume specified running agent as UserDatabaseSpec option USERDB compile-time macro users [See also recipients] $: operator and 2nd 3rd ~/.forward file of 2nd 3rd alias delivery to as LHS of alias default identities for groups local delivery to 2nd 3rd unknown mailing list instructions for marked with + running sendmail manually and trusted 2nd 3rd 4th unavailable verifying with SMTP USESETEUID compile-time macro USING_NETSCAPE_LDAP compile-time macro UUCP 2nd $k macro and 2nd eliminating support for F=d delivery agent flag and local handling of macros for repays and preferred delivery agent for uucp delivery agent UUCP_RELAY mc macro uucpdomain feature UUCPSMTP mc macro uuencode/ uudecode utilities
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