[ubuntu] Trying to understand sendmail

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http://ubuntuforums.org – All.. I'm not totally new to computers, linux etc etc so I have a good understanding of how things work. I used to have a qnap NAS with Piwigo, Zenphoto and a bunch of other apps. It all worked very well but I found that it was a little to slow (qnap TS212) a great little box but a little slow. (small memory, small CPU) So I had a spare laptop, installed Ubuntu, Piwigo, Zenphoto and my other apps from the NAS. The speed difference is amazing. Very happy. Love it..... With the NAS the above apps used to send email such as registration confirmation, notification of comments etc etc. The only (Hardware)