I have an Ubuntu server with postfix installed.
How can I set up a simple webmail package, so I can send email from a web interface to and from the local accounts and gmail?
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A simple solution is squirrel mail:
Certainly not the best web mail client ever, but easy to set up and reliable. A more fance client is roundcube. The
roundcube package is included in the multiverse repository.
Both solutions need an IMAP mail delivery agent. So you might need the
dovecot-postfix package or something similar.
In my opinion, G-mail is the best web mail client ever. You can have G-mail interface on your server if you sign up to Google Apps. If you run business, it cost some money, but it pays in the end. Check it out, I have very good experience with apps. You also get other google web applications such as docs, calendar etc.
If you run small company (up to 10 users), non-profit or for education, you can use apps for free: