UUCP message may be limited. Larger message will be dropped. This is useful for slow modem link. Setting the maximum to 0 will disable this feature (no limit).
Enter the name of users for whom you want to defeat the mail host definition. Messages will always be stored locally for those users. This feature is normally used for administrative pseudo user (root for one).
You may want to defeat the "present your system as" field for some users. One is root. This allow the recipient to differentiate easily from which system (which root ?) the message originates.
Check that if you intended to use special domain routing. Unfortunatly, linuxconf can't probe the sendmail distribution you have to know if this sendmail does support special routing database and which format is supported. These are compiled time option for sendmail and no sendmail command line option allows the retrieval of those compiled time features.
Sendmail may use several format for some of its database.
It generally default to the dbm
format. Please note that
that some Sendmail only support one format (dbm). This is
a compile time option.
Different utilities are used to manage email sent to local user. Those utilities provide various extension allowing the user to tailor the delivery. procmail for one supports fancy filtering. Some people use procmail to split incoming messages in several inboxes based on various criterion.
You can leave this field empty and linuxconf will locate the proper utility available on your system.
This feature is intended for people without a continuous internet connectivity. This tells sendmail to save the mail without further checking. Later on, one can trigger the delivery of the mail. This is usually done by specifying a post connection command (see linuxconf ppp dialout support) like "/usr/sbin/sendmail -q". This force sendmail to process its queue and deliver the messages.
Once in a while sendmail wakes up and tries to deliver the email it was not able to deliver at first previously. You can see the content of the queue with the command mailq without arguments.
People without continuous internet connectivity may want to play here. Setting the delay to 0 disable the feature. If your connectivity is on demand, you may want to put a larger number such as 30 minutes. When sendmail will wake up, it will/should trigger a connection.
Those who disable the feature may want to control sendmail by hand (or with a cron job) with the command
/usr/sbin/sendmail -q
Some mail clients which use SMTP to send email are broken. They generate bad HELO sequences. Sendmail normally rejects such connections. With this option, sendmail is tolerant. It still accepts valid connection.