Hello,

I use the version of mantis 1.2.19
We changed mail server for Exchange and since we could not send the mails.

// Configuration du mode de mail 
 define ("SMTP_SEND",2);
 $g_phpMailer_method = SMTP_SEND;        
 $g_smtp_host='xx.xx.xx.xx';         
 $g_smtp_port=25;

 //$g_smtp_username='xxx@xxxx.fr';
 $g_smtp_username='mantis@xxxx.fr';  
 $g_smtp_password='xxxx';
 $g_smtp_connection_mode = '';

 $g_mail_priority = 3;
 $g_from_name = 'Mantis Bug Tracker';
     $g_log_level = LOG_EMAIL | LOG_EMAIL_RECIPIENT | LOG_DATABASE;
 $g_debug_email = ON;    

$g_allow_signup = ON; //allows the users to sign up for a new account
$g_enable_email_notification = ON; //enables the email messages

$g_log_destination = 'file:C:\Apache22\htdocs\Mantis\mantis.log';
$g_validate_email = OFF;

log :
13-02-2018 16:27 mail Sending message 0000088 queued on 13-02-2018 16:27
13-02-2018 16:27 mail ERROR: Message could not be sent - L'adresse courriel n'est pas valide : : 1
13-02-2018 16:27 mail Sending message #89 queued on 13-02-2018 16:27
13-02-2018 16:27 mail ERROR: Message could not be sent - L'adresse courriel n'est pas valide : : 1