When sending composed mail, Squirrelmail 1.4.2
generates a "Received" line which contains a valid
login id and may contain a valid internal network
address for the system upon which it is run. Such
information is useful to hackers and should not
generally be made public.
Possible solution is to modify code in
Deliver.class.php at or about line 260 to remove
generation of the "Received" line associated with the
"SquirrelMail authenticated user". Note that the MTA
will generate a separate "Received" line indicating
reception of the mail from SquirrelMail (using the less
sensitive userid "apache" and the MTA's translation of
its hostname); hence the SquirrelMail-generated
"Received" line is redundant.