You could put hyperlinks in your Text widgets, that run the mail program, when clicking on the hypertext link. An example, without the actual mailcode....which should be forked off or threaded.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $mw = MainWindow->new( -title => "hyperlinks" );
my $t   = $mw->Scrolled('Text')->pack;
my $tag = "tag000";

foreach (<DATA>) {
    chomp;
    my (@items) = split (/(http:\S+)/,$_);

    foreach (@items) {
        if (/(http:\S+)/) {
            $t->insert( 'end', $_, $tag );
            $t->tagConfigure( $tag, -foreground => 'blue' );
            $t->tagBind( $tag,
                '<Any-Enter>' => [ \&manipulate_link, $tag, 'raised', 
+'hand2' ]
            );
            $t->tagBind( $tag,
                '<Any-Leave>' => [ \&manipulate_link, $tag, 'flat', 'x
+term' ] );
            $t->tagBind( $tag,
                '<Button-1>' => [ \&manipulate_link, $tag, 'sunken' ] 
+);
            $t->tagBind( $tag,
                '<ButtonRelease-1>' =>
                  [ \&manipulate_link, $tag, 'raised', undef, \&printm
+e ] );
            $tag++;
        }
        else {
            $t->insert( 'end', $_ );
        }
    }
    $t->insert( 'end', "\n" );
}
MainLoop;

sub printme {
    local ($,) = " ";
    print "printme:", @_, "\n";
}

sub manipulate_link {

    # manipulate the link as you press the mouse key

    my ($a)      = shift;
    my ($tag)    = shift;
    my ($relief) = shift;
    my ($cursor) = shift;
    my ($after)  = shift;

    # by configuring the relief (to simulate a button press)
    $a->tagConfigure( $tag, -relief => $relief, -borderwidth => 1 );

    # by changing the cursor between hand and xterm
    $a->configure( -cursor => $cursor ) if ($cursor);

    # and by scheduling the specified action to run "soon"
    if ($after) {
        my ($s) = $a->get( $a->tagRanges($tag) );
        $mw->after( 200, [ $after, $a, $s, $tag, @_ ] ) if ($after);
    }
}
__DATA__
Hi there.  This is text.
THis is more text but http://this.is.a/hyperlink in a line.
http://this.is.another/hyperlink followed by
http://this.is.a.third/hyperlink
__END__
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