U[ Top ]
UBE (unsolicited bulk email) (see spam)
UCE (unsolicited commercial email) (see spam)
UID command (IMAP), 173
UIDL command (POP3), 147
Uniform Resource Indicators (URIs), 89
Uniform Resource Locators (see URLs)
universal messaging, 333
Unix
line separators, 24, 51
mailbox format, 102, 106
mailcap ?les on, 114-116
POP3 on, 136, 142
unsolicited bulk email (UBE) (see spam)
unsolicited commercial email (UCE) (see spam)
UNSUBSCRIBE command (IMAP), 163
Update State (POP3), 139, 149
UPDATECONTEXT command (ACAP), 193-194
URIs (Uniform Resource Indicators), 89
URLs, 92
email-related, list of, 351
US-ASCII plain text
specifying charset as, 43
(see also ASCII)
Usenet newsgroups
spam and, 321
Usenet newsgroups, spam and, 320
USER command (POP3), 141
V[ Top ]
vCard, 83-85
attaching to email messages, 98-100
version 2.1, 97-98
version 3.0, 85-95
VERB command (ESMTP), 125
video ?les, 60
integration with email, 335
VRFY command (ESMTP), 123
W[ Top ]
Windows
line separators, 51
mailcap ?les on, 116
Windows NT, mailcap ?les on, 116
X[ Top ]
X.400 standard, 2, 4-5
X.500 standard, 4
X-Mailer header, 35