When I do not authenticate I get:

Net::SMTP=GLOB(0x80fe114)<<< 550-(localhost.localdomain) [remover by s
+ilverbird] is currently not permitted to relay
Net::SMTP=GLOB(0x80fe114)<<< 550-through this server. Perhaps you have
+ not logged into the pop/imap server
Net::SMTP=GLOB(0x80fe114)<<< 550-in the last 30 minutes or do not have
+ SMTP Authentication turned on in your
Net::SMTP=GLOB(0x80fe114)<<< 550 email client.
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When I try to authenticate I get a message like this:

Can't locate Authen/SASL.pm in @INC (@INC contains:
    /usr/lib/perl5/5.6.1/i686-linux /usr/lib/perl5/5.6.1 /usr/lib/perl
+5/site_perl/5.6.1/i686-linux /usr/lib/perl5/site_perl/5.6.1 /usr/lib/
+perl5/site_perl/5.6.0 /usr/lib/perl5/site_perl .) at /usr/lib/perl5/s
+ite_perl/5.6.1/Net/SMTP.pm line 102 (#1)
    (F) You said to do (or require, or use) a file that couldn't be
    found. Perl looks for the file in all the locations mentioned in @
+INC,
    unless the file name included the full path to the file.  Perhaps 
+you
    need to set the PERL5LIB or PERL5OPT environment variable to say w
+here
    the extra library is, or maybe the script needs to add the library
+ name
    to @INC.  Or maybe you just misspelled the name of the file.  See
    perlfunc/require and lib.
[download]

Whne I try to use help("AUTH") I just get a list of commands supported by the server (AUTH is one of them). Can anyone help me on either getting help on authenticating or teach me how to authenticate? Thanks