Which file, when using Sendmail or a similar MTA system, will allow a user to redirect all their mail to another address and is configurable by the…

The ~/.forward file is a file that users can create in their home directories to redirect mail or send

mail using sendmail or a similar MTA system. The file contains a list of recipient addresses, which can

be email addresses, file names, program names, or :include: files. The file must be owned by the user

and have the read permission bit set for the owner. The file cannot be a symbolic link or have more

than one hard link. The file is processed by sendmail when a recipient address selects a delivery

agent with the F=w flag set. If the file contains a backslash, further processing is disabled and the

message is delivered to the user’s mail-spooling directory. If the file does not exist or cannot be read,

it is silently ignored. The ~/.forward file is different from the /etc/aliases file, which is a system-wide

file that maps aliases to one or more recipient addresses. The /etc/aliases file is maintained by the

system administrator and requires running the newaliases command after any changes. The ~/.alias

file is not a valid file for sendmail or similar MTA systems. The /etc/mail/forwarders file is not a

standard file for sendmail or similar MTA systems. The ~/.vacation file is a file that contains a vacation

message that is sent to the sender when the user is away. The ~/.vacation file is used in conjunction

with the vacation program, which can be invoked from the ~/.forward file. Reference: