Index U

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ucpsi-tcp 
UFLINE environment variable 
Unix
    mail sorting 
    Maildir compatibility 
upgrading, advisability of 
user database 
USER environment variable 
user id
    creating 
        adduser script 
        manually 
    local mail delivery 
users
    ~alias mailbox 
    local, mailbox format 
    mailboxes, creating Maildirs 
    remote, IP tunneling 
    roaming
        authenticating with POP-before-SMTP 
        recognizing 
        vpopmail 
users database
    address mapping 
    advisability of 
    creating 
    mail-only accounts, creating 
    POP toaster and 
    principles of operation 
    subaddress separator character, changing 
uucp hosts, routing