Evolution, Sendmail, Exim: SMTP question
Maybe somebody more experienced with mail servers can answer this question for me. I've solved my problem, but I don't know why -- other than the fact that I'm one lucky noob.
I have a work email address. I can access its pop server from home, but I can't access its smtp server from home. I think this is fairly normal.
I wanted to be able to send email with that address. I didn't care which smtp server handled it, I only wanted the address to appear intact -- intact as the address given for "reply to", and "sent from".
I use evolution. I set the outgoing mail server option as sendmail. I tried to send a message, and it didn't work. I installed the exim4 package from the repository, did not adjust anything, and lo and behold, my mail was sent. Can anybody tell me why?
First question: My perusal of the forums leads me to think that my outgoing mail is somehow being handled through a server on my machine called "localhost". I thought servers were big computers that sit in a basement.
Second question: why wouldn't the evolution sendmail option handle this task alone? Why did it need exim to be installed?
Final question: what is postfix's role in all of this? Is exim4 a replacement for postfix?
Toshiba Satellite A105-S2031 Lubuntu 13.04