Possible enumeration values:

NameValueDescription
ALL

0

This searches for all future messages.

TODAY

1

This searches for all future messages that will be sent today.

TOMORROW

2

This searches for all future messages that will be sent tomorrow.

THIS_MONTH

3

This searches for all future messages that will be sent this month.

NEXT_MONTH

4

This searches for all future messages that will be sent next month.

THIS_YEAR

5

This searches for all future messages that will be sent this year.

CUSTOM

6

This searches for all future messages that will be sent tomorrow.