|Nevis1 Mail Forwarding||
On 16:00 Mon 26-Aug-2002, I plan to change the sendmail configuration on nevis1.
The machine will no longer send mail on its own, but forward it to the main mail server,
franklin, for further processing. This web page
As part of the transition in mail services at Nevis, as of 26-Aug-2002 I plan to change the mailer configuration on nevis1. The sendmail program on nevis1 will act as a "null client": it will not directly send nor receive any mail on its own. All the mail processing will be forwarded to the main mail server, franklin.
By the way, this is exactly the same sendmail configuration that's used on all the machines in the Nevis Linux cluster except for franklin itself.
This change is part of the transition of mail and other network services from nevis1 to the Linux cluster. The first part of the transition, putting the new mail server into use, took place in May 2002.
|Why this is being done|
Ever since franklin became the main mail server at Nevis, all the mail that is sent to Nevis flows through it. Any mail sent from (or to) any machine in the Nevis Linux cluster is also routed via franklin. There is one exception: nevis1, which has been running a full-fledged mail server on its own.
This has made mailer configuration more difficult. If you send e-mail to email@example.com from anywhere else on the planet, it reach its appropriate destination. But if you send e-mail to firstname.lastname@example.org from nevis1, it won't get there unless Jane Smith maintains a separate account on nevis1. And if Jane Smith has a different home directory defined on nevis1 versus the Linux cluster, then she has to edit ~/.forward files on two different machines to make sure her mail is forwarded properly.
Also, the mail program on nevis1 is a very old version with several security holes; it's also more difficult to configure. It's time to retire it, and allow the more secure franklin to handle the mail.
|Frequently Asked Questions|
Eventually I plan to migrate the IMAP and POP services solely to franklin, but that change is months in the future.
Note added 08-Oct-2002: This turns out to be bad advice. The best thing to do is to read your mail using IMAP on franklin. To do this, change your Pine inbox to:
The following two sections describe the only ways you might be affected by this change in mail processing on nevis1.
|Your "From" header|
When franklin processes your mail, it will convert an address in the "sender" or "From" header lines from <account>@<machine>.nevis.columbia.edu to <account>@nevis.columbia.edu. This "canonicalization" of the mail addresses will make life easier for us in the future; in particular, if we have to switch mail servers again, you won't have to keep changing your e-mail address.
However, this was not done on nevis1; all mail sent from that machine has a "From" address of <account>@nevis1.nevis.columbia.edu. This will pose a problem if you send mail to a service that restricts access based on the "From" part of your e-mail header. Many list-servers (in particular, those at BNL) will reject mail from email@example.com if only firstname.lastname@example.org is on their list of acceptable users.
If you are on such a group mailing list, you'll have to inform the maintainers of the list of upcoming change in your e-mail address.
On the page that described the switch to the new mail server, I went into detail about the consequences of having a different home directory on your Linux account.
After the change in mail processing on nevis1, your home directory as seen by nevis1 will become irrelevant to how your mail is received; your home directory as defined on the Linux cluster will define how your mail is processed.
Here are the cases to be considered:
For the last two cases, you may want to copy your mail directories on nevis1 to your home directory on the Linux cluster. The following commands, executed on the cluster, will probably do what you want:
If you have any difficulty, please feel free to contact me to help you move your mail files to the Linux cluster.
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