We are using mantis in our company as a bug tracking system. everything is working just fine except that we cannot make mantis to send emails. i tried everything.
i am trying to make it send from "Gmail", i am also using Bloxamp as my webserver, and i was before that using wamp server to send these emails but the samer problem happened.

here is my configuration in the "config_inc.php" file:

#############################
# Mantis Email Settings
#############################

# --- email variables -------------
$g_administrator_email  = 'samerkq@gmail.com';
$g_webmaster_email      = 'samerkq@gmail.com';

# the sender email, part of 'From: ' header in emails
$g_from_email           = 'samerkq@gmail.com';

# the sender name, part of 'From: ' header in emails
$g_from_name            = 'Mantis Bug Tracker';

# the return address for bounced mail
$g_smtp_port = '587';
$g_smtp_connection_mode = 'ssl';

$g_return_path_email    = 'samerkq@gmail.com';

# allow email notification
#  note that if this is disabled, sign-up and password reset messages will
#  not be sent.
$g_enable_email_notification    = ON;

# The following two config options allow you to control who should get email
# notifications on different actions/statuses.  The first option (default_notify_flags)
# sets the default values for different user categories.  The user categories
# are:
#
#      'reporter': the reporter of the bug
#       'handler': the handler of the bug
#       'monitor': users who are monitoring a bug
#      'bugnotes': users who have added a bugnote to the bug
# 'threshold_max': all users with access <= max
# 'threshold_min': ..and with access >= min
#
# The second config option (notify_flags) sets overrides for specific actions/statuses.
# If a user category is not listed for an action, the default from the config
# option above is used.  The possible actions are:
#
#             'new': a new bug has been added
#           'owner': a bug has been assigned to a new owner
#        'reopened': a bug has been reopened
#         'deleted': a bug has been deleted
#         'updated': a bug has been updated
#         'bugnote': a bugnote has been added to a bug
#         'sponsor': sponsorship has changed on this bug
#        'relation': a relationship has changed on this bug
#        '<status>': eg: 'resolved', 'closed', 'feedback', 'acknowledged', ...etc.
#                     this list corresponds to $g_status_enum_string

#
# If you wanted to have all developers get notified of new bugs you might add
# the following lines to your config file:
#
# $g_notify_flags['new']['threshold_min'] = DEVELOPER;
# $g_notify_flags['new']['threshold_max'] = DEVELOPER;
#
# You might want to do something similar so all managers are notified when a
# bug is closed.  If you didn't want reporters to be notified when a bug is
# closed (only when it is resolved) you would use:
#
# $g_notify_flags['closed']['reporter'] = OFF;

$g_default_notify_flags = array('reporter'  => ON,
                'handler'   => ON,
                'monitor'   => ON,
                'bugnotes'  => ON,
                'threshold_min' => NOBODY,
                'threshold_max' => NOBODY);

# We don't need to send these notifications on new bugs
# (see above for info on this config option)
#@@@ (though I'm not sure they need to be turned off anymore
#      - there just won't be anyone in those categories)
#      I guess it serves as an example and a placeholder for this
#      config option
$g_notify_flags['new']  = array('bugnotes'  => OFF, 'monitor'   => OFF);

# Whether user's should receive emails for their own actions
$g_email_receive_own    = OFF;

# set to OFF to disable email check
$g_validate_email       = ( substr( php_uname(), 0, 7 ) == 'Windows' ) ? OFF : ON;
$g_check_mx_record      = OFF;  # Not supported under Windows.

# if ON, allow the user to omit an email field
# note if you allow users to create their own accounts, they
#  must specify an email at that point, no matter what the value
#  of this option is.  Otherwise they wouldn't get their passwords.
$g_allow_blank_email    = OFF;

# Only allow and send email to addresses in the given domain
# For example:
# $g_limit_email_domain     = 'users.sourceforge.net';
$g_limit_email_domain   = OFF;

# This specifies the access level that is needed to get the mailto: links.
$g_show_user_email_threshold = NOBODY;

# If use_x_priority is set to ON, what should the value be?
# Urgent = 1, Not Urgent = 5, Disable = 0
# Note: some MTAs interpret X-Priority = 0 to mean 'Very Urgent'
$g_mail_priority        = 3;

# select the method to mail by:
# 0 - mail()
# 1 - sendmail
# 2 - SMTP
$g_phpMailer_method     = 2;

# This option allows you to use a remote SMTP host.  Must use the phpMailer script
# One or more hosts, separated by a semicolon, can be listed. 
# You can also specify a different port for each host by using this 
# format: [hostname:port] (e.g. "smtp1.example.com:25;smtp2.example.com").
# Hosts will be tried in order.
$g_smtp_host            = 'smtp.gmail.com:465';

# These options allow you to use SMTP Authentication when you use a remote
# SMTP host with phpMailer.  If smtp_username is not '' then the username
# and password will be used when logging in to the SMTP server.
$g_smtp_username = 'samerkq@gmail.com';
$g_smtp_password = 'sedswaq';

# It is recommended to use a cronjob or a scheduler task to send emails.  
# The cronjob should typically run every 5 minutes.  If no cronjob is used,
# then user will have to wait for emails to be sent after performing an action
# which triggers notifications.  This slows user performance.
$g_email_send_using_cronjob = ON;

# Specify whether e-mails should be sent with the category set or not.  This is tested
# with Microsoft Outlook.  More testing for this feature + other formats will be added
# in the future.
# OFF, EMAIL_CATEGORY_PROJECT_CATEGORY (format: [Project] Category)
$g_email_set_category       = ON;

# --- email separator and padding ------------
$g_email_separator1     = str_pad('', 70, '=');
$g_email_separator2     = str_pad('', 70, '-');
$g_email_padding_length = 28;

i changed nothing else but this file.

i hope i get a response from you as soon as possible