When relaying mail using UUCP, the messages are normally queued and delivered at a regular interval. You may want to deliver these messages immediately. If you have a low traffic load, this is often necessary. Email is forwarded immediately and users are happy.
UUCP messages can be limited in size using this option. This is useful for slow modem links. Setting the maximum to 0 will disable this feature (no limit is set). Messages that exceed this value will be dropped.
Enter the name of users for whom you want to defeat the mail host definition. Messages will always be stored locally for these users. This feature is normally used for administrative pseudo users (root for one).
You may want to defeat the "present your system as" field for some users. One such user is root. This easily allows the recipient to determine from which system (which root?) the message originated.
Check this if you intend to use special domain routing. Unfortunately, Linuxconf can't probe the sendmail distribution. You need to know if this sendmail supports a special routing database and which format is supported. These are "compile time" options for sendmail. No sendmail command line option will allow for the retrieval of those compile time features.
Sendmail may use several formats for parts of its database.
It generally defaults to the dbm format. Please note that
that some sendmails only support one format (dbm). This is
a compile time option.
Different utilities are used to manage email sent to local users. Those utilities provide various extensions allowing the user to tailor the delivery. Procmail, for one, supports fancy filtering. Some people use procmail to split incoming messages into several in-boxes based on various criteria.
You can leave this field empty and Linuxconf will locate the proper utility available on your system.
Some mail clients that 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 connections.