sendxmpp is dead and rotting. I've decided to rewrite it in Haskell.
It aims to be a drop-in replacement regarding the CLI flags. It is user-friendlier, handles errors better and, unlike sendxmpp, it supports modern authentication and encryption schemes.
CLI usage help snapshot:
Usage: hsendxmpp [options] <recipient1> [<recipient2> ...]
-u user --username=user Use this username to authenticate to the server
-p password --password=password Use this password to authenticate to the server.
The password can also be provided via HSENDXMPP_PASSWORD environment variable to avoid it leaking into process lists, and it will override the CLI option contents.
-j server --jserver=server Connect to this server
-r res --resource=res Use resource res for the sender [default: 'hsendxmpp']
-c --chatroom Send the message to a chatroom (MUC)
-v --verbose Be verbose on what's happening on the wire