I do have my own email server, so I can mention what I did, which is to post through an external server, using my own server only for receiving. The server soft

I do have my own email server, so I can mention what I did, which is to post through an external server, using my own server only for receiving. The server software will accept messages from localhost and pass them to the next server (the ISP's server), and then that next server will forward it to the correct destination, rather than sending it directly to the destination.