Google Outbound Services Configuration Guide - Manual (Page 125)

Qmail 135
Increase Server Timeouts
The default timeout is 1200 seconds, which is long enough. If this value has been
previously changed, then edit the file
/var/qmail/timeoutsmtpd and increase it to
at least 900 seconds.
Set Up Smarthost
1. Edit (or create) the file /var/qmail/control/smtproutes and append the
following line:
outbounds[your system number].obsmtp.com
2. where [your system number] is your system number. To find what system to
use, see “Identify Your System” on page 13.
3. If you have certain internal domains whose traffic should not be routed to
Postini, you will want to add specific routing to the appropriate mail server to
the
/var/qmail/control/smtproutes file using the following syntax:
:
4. Stop and restart the qmail server.
Test Outbound Mail
1. Check the mail queues of the mail server to look for items with a retry state.
That could indicate outbound mail delays.
2. Send a message from a mail client inside your network to an outside address.
You should see a line in the header email which indicates being received and
delivered by
exprodNobM.obsmtp.com , where N and M are numbers.
3. Test inbound mail to confirm normal functionality. Send a message from an
outside email address to an address on your service.
4. Confirm that your mail server is not an open relay. An open relay will make
your mail server vulnerable to hijacking from spammers and will most likely
cause an interruption in service.
Use an external open relay test, such as http://www.mxtoolbox.com/
diagnostic.aspx or http://www.spamhelp.org/shopenrelay/ . If the result
shows that you have an open relay, correct your private relay settings. If you
see an uncertain response (such as “maybe” or “warning”) then check that
your private relay settings are correct.
See “Set Up Reinjection” on page 134 for the correct private relay settings.