Hello,

I am using Linode1024 server with,

Linux Operating: Ubuntu 14.04 LTS
HTTP Server: Nginx
SMTP server: Sendmail
Mail Transfer Agent (MTA): Postfix
PHP: 5.5.9
MySQL: 5.5

PHP's mail function is working fine on my website.

1) I want to use different email address like contact@mysite.com, admin@mysite.com with passwords. Where should I setup those emails addresses?
2) I also want the functionality to receive emails from my client.
3) I want to use "squirrelmail" webmail for receiving and sending emails, will it work on my system? If not, please suggest good webmail.

Thanks for the help.
Ankur

1) Follow the Linode guide to set up Postfix and Dovecot. You can create as many e-mail addresses as you like.

2) After setting up your mail server, you will be able to use any standard e-mail client to send and receive mail via SMTP and IMAP.

3) Squirrelmail will work fine - you can see some guides for installing it under Debian 7 and Ubuntu 12.04. Some people like Roundcube instead, but it's a matter of preference.

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/ Peter