Functions to influence message delivery speed and importance.
priority(msg, priority = NULL)
importance(msg, importance = NULL)A message object.
Priority level. One of "non-urgent", "normal", or "urgent".
Importance level. One of "low", "normal", or "high".
A message object.
The priority() function adds the Priority header field which gives a hint
to influence transmission speed and delivery. Valid values are
"non-urgent", "normal", and "urgent". The non-standard X-Priority
header field is similar, for which valid values are 1 (Highest), 2
(High), 3 (Normal, the default), 4 (Low), and 5 (Lowest).
The importance() function adds the Importance header field, which gives a
hint to the message recipient about how important the message is. Does not
influence delivery speed.
# How rapidly does the message need to be delivered?
#
envelope() %>%
subject("Deliver this immediately!") %>%
priority("urgent")
envelope(priority = "non-urgent") %>%
subject("No rush with this.")
# How much attention should be paid by recipient?
#
envelope() %>%
subject("Read this immediately!") %>%
importance("high")
envelope(importance = "low") %>%
subject("Not important at all. Just delete.")