I'm on www.ho-re-ca.biz with civicrm 2.1 beta3 and drupal 6.4
Outgoing SMTP configuration
SMTP server: Localhost
Authentication: user and password setted as well as the bluehost's helpdesk said
SMTP port: 25
Hack: Return-Path
• CRM/Mailing/BAO/Mailing.php
• Comment out line 857 (Reply-to) and 858 (Return-Path)
• 857 addresses the problem where BH no longer allows catchall mail accounts, so there is no way to grab reply-to emails that built with a token value. It simply disables this.
• 858 addresses problem outlined here:
http://www.nabble.com/CiviMail-Bounce-to8427763.html
I don't have set the cron job yet thus I am forcing the emails sending with this URL: http://www.ho-re-ca.biz/civicrm/mail...mid=11&reset=1
So If I send only a single mail from a contact I receive this error message
SMTP: Authentication failed. (code: 221, response: box448.bluehost.com closing connection)
But if I send a bulk mailing, after the forcing, I've got the 100% of bouncing in the report of the sending.
After that, if I take a look at the bouncing's link I can see this information: Bouncing type Unknown.



