Add a (key,value) pair to a message
@returns - NOTMUCH_STATUS_ILLEGAL_ARGUMENT: *key* may not contain an '=' character. - NOTMUCH_STATUS_NULL_POINTER: Neither *key* nor *value* may be NULL. - NOTMUCH_STATUS_SUCCESS: No error occured. @since libnotmuch 4.4 (notmuch 0.23)
See Implementation
Add a (key,value) pair to a message
@returns - NOTMUCH_STATUS_ILLEGAL_ARGUMENT: *key* may not contain an '=' character. - NOTMUCH_STATUS_NULL_POINTER: Neither *key* nor *value* may be NULL. - NOTMUCH_STATUS_SUCCESS: No error occured. @since libnotmuch 4.4 (notmuch 0.23)