Messaging Server 5.0
cis, single-valued (RFC 822 address)
inetLocalMailRecipient, icsCalendarResource, icsCalendarUser
Identifies a user’s primary email address (the email address retrieved and displayed by white-pages lookup applications).
This attribute and mailAlternateAddress, are the default attributes used for reverse searches.
mail=jdoe@sesta.com
0.9.2342.19200300.100.1.3