Administration |
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Administration |
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© 1998 Digital Integration (NZ) Ltd
Advanced Tab
Purpose
To configure advanced properties of i-Mail
General OptionsDefault: 4kb
Specify the amount of memory you would like i-Mail to use for copying files between directories. The higher the value, the faster i-Mail will work. You must have sufficient free memory on your server to handle large memory blocks. Leave this at default if a) you have limited memory or b) most of your messages are small text messages.
Default: Exclusive
This option sets the method which i-Mial writes the log file. In exclusive mode the log file is kept open, reducing the amount of disk activity and system resources required for log events. Open & Close mode opens the file each time a log event needs to be written. If the log file does not exist, Open & Close will re-create the file.
Use Open & Close method if you want to be able to archive off or delete the log file without restarting i-Mail.
Default: 1024
Use the send packet size to overcome problems with operating systems and routers that do not properly implement the OSI stack and have problems receiving more data at the TCP layer that the physical packet size permits. This problem normally presents itself in SMTP sends by a link which starts sending data, gets to a fixed value each time, say 65536 bytes, and stops responding causing a timeout and disconnect within i-Mail
Default: On
i-Mail can be configured to prevent unauthorized access to mail users without passwords. Use this feature to enhance the security of your network. This is also a convenient way to ensure new users have set their password (when using UserLink) as they will not be able to collect mail intil they have done so.
Default: On
When i-Mail collects mail from the Internet using POP collectors there is the chance of mail duplication. In the event of an external party sending a message to two (or more) of your users, the message will be received twice in the mailbox at the ISP. When i-Mail downloads these two messages it will find both recipients in each message, thus storing the message twice for each user. Deduplication allows i-Mail to scan the message and remember if it was previously received. If so the duplicate message is discarded.
Default: Off
Use this option to prevent multiple copies of messages that are sent as blind carbon copies. This option should only be required if your ISP does not stamp mail headers properly.
Default: 240
De-duplicating messages requires additional server memory, so i-Mail only remembers message duplicate messages for a set period of time before releasing the memory back to the operating system. Under normal circumstances 4 hours of retained memory is sufficient as duplicate messages are usually stored together, and thus downloaded at the same time. It is unusual to have duplicate messages delivered at different times and this is usually the exception, not the rule.
Default: Off
At the specified housekeeping time i-Mail purges all deleted temporary files such as lock files and state files from its directories. If you are salvage concious and are sure you will not need to recover message files that have been removed from the system, you can free up extra deleted space by turning this option on.
Default: On
When clients connect to i-Mail and i-Mail talks to other mail systems, transaction messages between the systems give human readable text explaining what is happening. Setting this option to on spices up these messages by randomly changing the messages. You may need to turn this off if developing software which checks the messages.
i-Mail has a special internal user called iMailServer which is used for client updates. If you want to have another name that responds to client requests, enter it here.
Default: Any Domain
The special internal user may be configured to respond to a particular set of domains. Generally the 'All Domains' scope is used with a standard company mail system, however when hosting multiple domains for downstream i-Mail systems such as an ISP using i-Mail as the host system, the iMailServer user may need to filter through to the downstream mail server. In this case selecting the Primary Domain option will only respond to the mail servers defined primary domain, sending other messages for iMailServer through to their respective mailboxes or remote domains.
Supporting hosted domains only will allow iMailServer requests to be forwarded to the Internet and to remote domains.
Supporting hosted/routed domains will respond to all iMailServer requests unless the domain is unknown (destined for the Internet, maybe another i-Mail system).
Default: 1
With printing in both standard and ADS versions of i-Mail and UserLink in i-Mail ADS a licenced connection is required for i-Mail to perform these functions. To prevent i-Mail from failing due to licence violations set a maximum simultaneous login count.
Default: 5
Set this to disconnect clients after a maximum password retry count.
Default: On
After pressing 'OK' in i-Mail Admin the server can be prompted to update its configuration. Turn this option off if you want to be able to manually tell i-Mail to update later by pressing 'C' at the server console.
Default: 100
For SMTP messages each 'hop', or mail server, that a message passes through will stamp a new received line at the beginning of the message. Setting a maximum figure here will prevent a message from entering into a loop, with an ever increasing message size. If the maximum header count is exceeded, the message will be moved into the badmsg folder, and a notification sent to the Postmaster.
Default: 0
When i-Mail sends messages to then Internet or to remote servers and when clients connect to i-Mail, for each recipient of a message there is a transaction informing of each recipient. This transaction is called 'RCPT TO:'. To prevent mass mailing through your server you can have i-Mail only accept a certain number of recipients per mail session. This setting also applies to the number of RCPT TO transactions that i-Mail will use when sending mail out. Additional recipients are put on hold for the next scheduled outbound processing run.
Default: 32
If a malicious SMTP client connects to i-MailDS and attempts various e-mail addresses, usually when trying to relay via your server, flood control will disconnect them upon reaching this number of invalid commands. This prevents attackers from getting malicious messages into or through your system, and also frees up resources by forcefully disconnecting the client.
Default: Off
With i-Mail AutoCC lists, i-Mail internally expands the original recipient of a message. When creating the message, each recipient can be embedded in the header. If you do not want the recipients of the list to know who all of the recipients are, turn this off. If you want the recipients to have the option of looking in their message header for the other recipients, turn this on.
Default: On
In the POP/SMTP connectors tab you may either specify to have mail delivered to your ISP SMTP server or have mail delivered directly to the recipient mail host. Generally you must allow i-Mail to use Mail eXchange records to look up the recipient if sending direct. This option has no effect on mail routed via the ISP SMTP server. If you use this option you must also supply a DNS server that can perform the MX lookup in the TCP Ports/Connections tab.
Default: Off
i-Mail can 'check up' on a user who is connecting to your system by performing an MX lookup on the incoming mailer. If the domain that the sender specifies is not a valid internet domain, i-Mail will reject any incoming mail requests. This option usually requires a dedicated internet link as every user who connects is looked up before being allowed access.
Default: Off
i-Mail can 'check up' the recipients of a mail message before accepting the message for delivery. Using this option allows i-Mail to reject recipients that would fail message delivery anyway. MX lookup must be enabled and DNS servers must be specified for this option to function. A dedicated internet link is also required as every RCPT TO entry is checked against valid internet domains.
Default: On
Use this option to prevent mail being accepted for domains other than those specified in the Domains Tab from clients that do not exist in your listed domains. When a client from a domain not listed in your domains tries to send mail to an unlisted domain it is rejected before entering the mail system, thus preventing the your server from being 'mail bombed'.
Default: On
This security feature will reject mail from a client who has not identified themself as being from a domain specified in the i-Mail domain tab. Turning this off can aid in configuring your e-mail clients as they will be unable to send mail until a correct reply-to address is set up.
Default: Off
If you are connected permanently to the internet or are using ETRN and have mail sent into i-Mail rather than i-Mail collecting all mail from a single POP account, this option will prevent mail that is not addressed correctly from being returned to the sender. Any names looked up that are for your domain, but do not exist in your user accounts or NDS tree are diverted to the PostMaster.
Default: Off
Use this option if your remote system or ISP drops the SMTP connection after an EHLO greeting.
Default: On
When i-Mail receives a message from an SMTP client using ESMTP, they may send additional options to the server. If you only want to allow i-Mail supported options, turn this option off. If left on, i-Mail will accept mail anyway, and just ignore any parameters that it does not understand.
Default: Off
This option lets desktop mail checkers (such as SpotCheck) test for the existence of mail in a users mailbox without requiring a password or disrupting other download activities for any given user. When enabled, any client can check how many messages are waiting in any mailbox, but cannot actually download or view the mail.
Default: Off
All licenced versions of i-Mail can be run in blind forwarder mode if required. Should you change from i-Mail being the primary server, and require it to do mail routing, you can switch the licence to a blind forwarder by checking this option.
If you have a virus scanner that can decipher raw internet mail messages, you can have i-Mail login as a user for its message storage activity to be scanned. Note: This option is not guaranteed to work, or guaranteed to be reliable. It is provided only as a service to those that can get it to work.
This button links to additional advanced settings. See below
Press this button to return all of the advanced features to their default values.
More Advanced Options Page
The SMTP to spool user provides a way to store an incoming message from an SMTP client directly to the mail spool folder to be processed as if it were downloaded from a POP mail account. Using this mechanism facilitates, among other things, the ability to integrate i-Mail with an e-mail virus checker. When i-Mail downloads mail from a POP account, the option for redirect allows mail to be immediately sent to a virus scan server which, after checking the message for viruses will send it on to the original recipient. This poses the problem that an e-mail message retrieved from a POP account may be for more than one recipient so when the virus scan server returns the mail into i-Mail it needs to be put into the message spooler for interpretation. This is achieved with an SMTP to spool user. Simply provide i-Mail with a name that is indicative of the task i.e. AntiVirus in the user list and any mail for AntiVirus@yourdomain.com will be redirected into the message spooler. i-Mail will then process the message as if it had just been downloaded from the internet.
© 1998 Digital Integration (NZ) Ltd
