no mail sent when tickets are replied to

Please start by reviewing the documentation included with the module:
http://drupalcode.org/project/support.git/blob/refs/heads/6.x-1.x:/INSTA...

Mail specific documentation can be found at:
http://drupalcode.org/project/support.git/blob/refs/heads/6.x-1.x:/MAIL.txt

Be sure your Drupal website is properly configured to send email, and that you've enabled notifications at admin/support/settings.

I'm having same issue.

Email settings is ok for me, because I get message denied if I send email from a non registered email. But when send from a registered user, ticket is created, no email for confirmation (to customer or admin). Also, when ticket is updated, no email sent.

Im using 6.1.8 too

Note: I think this is a old issue that wasn't reviewed anymore: http://drupal.org/node/670080

Thanks for this great module

#670080: Emails notification subscription of ticket authors does not happen when they open new tickets by sending email to support is a request to send emails to non-registered accounts that don't otherwise have access to the ticketing queue. Is this what you're trying to do?

When you say "registered user", does this user have permissions to access the ticket queue where his email is generating a ticket? Is this problem only when you update by email, or also when posting from a web browser?

If affecting when posting from a web browser, please go to admin/support/settings and make sure Notifications are enabled, and Visual Feedback to "To All Users" and post your update; at the top of the page, do you see any indication of notifications being sent?

Finally, in any case review the Drupal watchdog log, are there any errors in there?

About your questions:

#670080: Emails notification subscription of ticket authors does not happen when they open new tickets by sending email to support is a request to send emails to non-registered accounts that don't otherwise have access to the ticketing queue. Is this what you're trying to do?

No, this is a registered user that send a support ticket from his email, don't receive notification about if this was created.

If affecting when posting from a web browser, please go to admin/support/settings and make sure Notifications are enabled, and Visual Feedback to "To All Users" and post your update; at the top of the page, do you see any indication of notifications being sent?

Yes, this is enabled and show "Sent notification to myemail@email.com" but email isn't sent, and watchdog also doesn't show a entry for this action (email isn't send from Drupal).

Finally, in any case review the Drupal watchdog log, are there any errors in there?

No, any errors in watchdog.

Thanks for you help

If the user logs into the Drupal site and posts an update with their web browser, is an email sent then?

I just tried and no, message says "Notification sent to xxxx@xxx.com" but watchdog didn't show any activity for this, also email isn'r received. some weird hu?