Background:
I downloaded Open Atrium, set up a platform with it, and then tried setting up a site with that platform.
Install fails on "could not send out e-mail".
I think, "No worries, I'll set the password manually". So I do, I run enable on the site (succeeds) and try to log in. I don't get a front page, but a bunch of warnings like:
"Warning: No database selected query: SELECT 1 FROM access WHERE type = 'host' AND LOWER('my.ip.adress') LIKE LOWER(mask) AND status = 0 LIMIT 0, 1 in /var/aegir/platforms/atrium-1-0-beta6/includes/database.mysqli.inc on line 128"
Problem:
I now try to disable the site, and get
"Drush command could not be completed"
I've tracked this down to
drush/includes/environment.inc:701
where the program stops.
I would venture a guess that the reason for this is that the $url variable has content:
://:@/
Which looks bad.
What I do now however, I don't know.
Suggestions welcome :)

Comments
If a site install failed, it
If a site install failed, it automatically is set to Disabled, but running Enable on the site won't make it work (we should try and prevent that option, but it is tricky)
You need to manually delete the site in this scenario (see here )
Then I would look at why your machine can't send the outbound mail (I'm surprised it fails outright at that).
Raise your php-cli memory_limit to 64M or higher if it isn't already, as openatrium installation requires a bit more beef
and then try another install
Thanks :) I removed the
Thanks :)
I removed the previous install according to your instructions in the linked thread. Trying again, I get the same problem:
WD php: mail(): Could not execute mail delivery program '/usr/sbin/sendmail -t -i ' in /var/aegir/platforms/atrium-1-0-beta6/includes/mail.inc on line 193.
$ grep "memory_limit" /etc/php/cli-php5/php.ini
memory_limit = 128M ; Maximum amount of memory a script may consume (128MB)
Installing 6.16 works well, and the sent e-mail arrives, so postfix works. Seems to be specific to Atrium?