The Email outgoing server can be configured in Settings>>Technical>>Email>>Outgoing mail serversrver

Incoming Server Configuration:

Server Type : POP Server
Server Name:  pop.gmail.com
Port: 995
SSL/TLS: True
Username: user@gmail.com
Password: userpwd

For a [gmail] incoming port server, you can either choose IMAP (port 993) or POP (port 995) protocol - summarized here.

From gmail help article, it seems IMAP is a more modern protocol, so I chose it.

For Incoming Mail Server, assuming you chose the IMAP protocol instead of POP:

Navigate to Settings/Configuration/General Settings/Configure the incoming email gateway

Name          : *anything you want*
Server Type   : IMAP server
Server Name   : imap.gmail.com
Port          : 993
SSL/TLS       : [✔] *make sure to check this or else you will get an error*
Supply your email address and password. 
I did not supply any other information to the Server Action Field or to the Advanced tab.

Only OpenERP users that supply their email address and password to the Configuration can fetch the unread messages in their inbox and will appear in the Messaging Module. As I have read, OpenERP will fetch every 5 minutes but you can press Fetch Now to force the fetch.

BTW, i'm using google apps email server but I'm using a custom domain, so my email looks like: myname@customdomain.com but is still served by gmail

actual screenshot of my settings

For an outgoing email setup, even if I configure all the emails of many users, the email is always sent from the first configured [outgoing] email, also asked here

All emails that arrive on my inbox is from openerp@mycustomdomain.com. I also don't know how to change the "from" address. Maybe Fabien's suggestion of configuring a local server will make it work.

So finally I succeded in getting emails for a single email to a discussion group.

• Create an imap account for that email test@test.com
• Change the alias on the discussion group to test@test.com -In Actions to Perform on Incoming emails => Create new Record "Discussion group"

This worked for me. But I still do not understand why some messages are sent and others not.

Question: I want the users to get additionally emails on all the notifications from their message inbox. I changed the preferences to "Incoming Emails and Discussions" but user do not get new messages?

You can configure your mail gateway of any service provider, for example if you are using gmail then the configuration will like this, •Gmail SMTP server address: smtp.gmail.com •Gmail SMTP user name: Your full Gmail address (e.g. example@gmail.com) •Gmail SMTP password: Your Gmail password •Gmail SMTP port: 465 •Gmail SMTP TLS/SSL required: yes other mail options are also available.

Thanks to all your feedback, I can now send Emails using ERP. I am still exploring ERP so it is very helpful for me. :)

But can you also help me with configuration of Incoming Mail Servers. I really don't have idea on how to configure it. thanks again in advance

Server name : smtp.gmail.com

Port: 465   

User name: something@gmail.com

Password:****

Priority  : 10