Mailio

Instead of listing all messages, there is a possibility to search only for messages by the specific criteria. The list of supported criteria by Mailio is represented by imap::search_condition_t::key_type. The associated value can be one of the following in imap::search_condition_t::value_type. With that in mind, each crieria is constructed by giving the key and the value to the imap::search_condition_t's constructor. The method imap::search takes list of conditions by applying the AND logical operator. The result of the messages is stored into a list of message ids given as the second parameter to the method. There is also the third argument of the imap::search as the flag, which specifies whether the messages are searched by sequence or unique ids.

To find all messages before June 22nd 2018 with the subject "mailio", one should execute

list<unsigned long> messages;
list<imaps::search_condition_t> conds;
conds.push_back(imaps::search_condition_t(imaps::search_condition_t::BEFORE_DATE, boost::gregorian::date(2018, 6, 22)));
conds.push_back(imaps::search_condition_t(imaps::search_condition_t::SUBJECT, "mailio"));
conn.search(conds, messages, true);