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..., when I want click send. :S logs: mail.info: http://pastebin.com/f1bca774f mail.log: http://pastebin.com/f5c0be27c mail.warn: http://pastebin.com/f46806d2f other logs are empty #################### Info about the os & softwares [e.g.: "dpkg -l | grep postfix"]: http://pastebin.com/f1d0cefd2 192.168.56.4 is the client 192.168.56.5 is the server [VirtualBox, Host-Only networking, they can ping each other] #################### Later I want to use it with Squirrel Mail [plus spam filtering + antivirus], but first, I just want to get it work :( Thank you for any help :S [_good_ docs, h...