You don't show us a script, but this is what use strict; does - it forces you to predeclare all the variable names you intend to use. This is a good thing because it finds typos like the following:

use strict;

my $variable_with_a_very_long_name = 1;
print "The value is >>$varaible_with_a_very_long_name<<";
[download]

As your script seems to work with use strict; commented out, likely your script contains no typos and all you need is to predeclare your global variables:

# for global variables:
use vars qw(@users $account);
[download]

If a variable isn't used in global scope, you want to declare it lexically within the block it is used in via the my keyword:

for $user (@users) {
    $message = "Hello $user!";
    ...
};

# should become

for my $user (@users) {
    my $message = "Hello $user!";
};
[download]

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.