All pages below are out of date in 2020.
All pages below are out of date in 2020.
Updated information at: Classic Linux.
Also please see: https://discourse.rahul.net/.
The server oxygen.rahul.net is running CentOS 5.3, a Linux distribution. This server is now available for testing to all users who have shell accounts in the classic_linux_old environment. Please read the following carefully, including especially the Warnings section, before logging into this server.
Other equivalent servers are listed on the classic_linux_old page.
All the information below should be equally valid for those servers.
The following programs are available:
Please see the page Mailbox Changes for definitions of the terms old inbox and new inbox. Also, on the same page, you will find directory names reserved by the new mail system.
This machine does mail delivery into a new inbox, which is a mailbox in the Maildir format.
No mail is currently delivered on this machine. (It will be after our upcoming mail system migration is completed.)
If you wish to test mail
delivery on this machine, you will need to first forward your mail to
USER@only-oxygen.rahul.net where USER is your login name. Once you do so,
your mail will arrive at oxygen.rahul.net and will be delivered into a
new inbox which resides in the
Maildir directory within your home directory. This
mailbox has a directory structure with each message being stored as
a separate file.
To forward your mail to only-oxygen.rahul.net, you can't just use a
file, as it will cause an infinite loop. Instead, use conditional
forwarding as described on the Procmail page.
Once mail has been delivered as above, you can read it locally by the following methods.
mailx -f imap://mauve.rahul.net/inbox” and enter your login name and password when prompted.
Also, you can read mail on oxygen.rahul.net and other newer machines remotely with any POP or IMAP client. See ports_and_protocols.
For processing and filtering mail:
For checking to see if incoming mail was rejected by one of the machines:
If using nmh (previously known as mh), have a file called “
in your home directory containing these lines:
Path: MH inc: -file Maildir/ -truncate
The Path: line sets your nmh directory to
MH, which will help prevent any conflict with
directory names used by the IMAP and POP servers
on the new machines.
With these settings, when you use the
inc command from the command line,
it will incorporate mail from your new inbox, i.e.,
Maildir mailbox, into nmh's own mailbox in the Mail directory. These messages
will become visible when you use the
If you do not have the “inc” line in your “
.mh_profile” file, then
explicitly use the command like this to get new mail:
inc -file Maildir/ -truncate
To incorporate mail from your old inbox, you must not have the “inc” line in your
.mh_profile” file. Then use one of the following commands:
% inc -host mauve.rahul.net -notruncate % inc -host mauve.rahul.net
Use the first one (with -notruncate) to just get a copy of the mail while leaving the original inbox unchanged. Use the second one (without the -notruncate) if you want to empty out the old inbox.
In either case, you will be prompted for your password.
Please point your web browser to the URL below:
(An analogous control panel is available for each CentOS 5 machine. Simply use its
hostname instead of
This will let you log into the Usermin control panel, where you can perform a number of activities on oxygen.rahul.net, including:
Configuration file conflicts. Most of the programs listed above will try to read or write various configuration files in your home directory and subdirectories. These may conflict in unpredictable ways with the same or similar program that you have used on the older Classic Linux machines. Thus you should save backups copies of appropriate configuration files as needed.
Bugs. This is a newly-deployed machine, and it might not always behave in the same way as our older machines. Some of the commands available might take slightly different options or produce different results. The software installed on this machine might be updated or reconfigured with little or no notice.
Please follow the problem-reporting procedures described on our mail system migration page.
This is beginning of our next-generation shell-oriented Linux environment. Once oxygen.rahul.net is functioning reliably, we will migrate all processing to it and other similar machines.