ofxPop3Utils: allows to attach several mail accounts and set an interval for checking them. It will check in it’s own thread and advice of new mail arrival by generating an event to which you can add listeners using the same sintax as for 0.06 ofMouseListener, ofKeyListener…
ofxSmtpUtils: once you define in ofxMailUtils.h the smtp server and port, it allows to send new mails. It has blocking (sendMessage) and unblocking (addMessage) functions.
Both of them use some structs defined in ofxMailUtils.h for specifying the accounts and sending and receiving mails.
There’s an example in the addon that uses both smtp and pop3 you’ll need to set the right account data and smtp server and port.
By now it only supports plain text authentication: