I have been trying to move from MailChimp to Mass Mail in Odoo 8 but am finding many issues.
The major issue is a significant number of emails not recieved
A typical email out will go to 1700 people but ony 75% are are shown as sent in the stats and a 22% open rate.
Compare this with MailChimp, all were sent and 41% open rate.
I did a test 2 days a go where I sent an email from both systems and found several hundred people replied to the MailChimp saying they had not recieved the Odoo mail and it was not in the spam folder.
Other issues are being able to use a 3 column layout formats diferently in some mail clients and is not easily readable
Bounced emails do not show the bounce reason so I have no idea what to look into to fix the bounce.
If you have identified any solutions to the above I and my developer would love to know.
Tim
Can you see the failed / bounced e-mails under settings > Email > Emails? If so, in what state/color are they? You could always try to re-send them from there by the way. It is not ideal and not the perfect way but hey atleast you get your e-mails out. Another way to find out more is to try and send some e-mails while you have the option --log-level=debug set when you start your Odoo server. By doing so you will get a lot more details in your Ubuntu terminal and perhaps one pops up there which gives you an idea about what is wrong!