I tried to send out 411 mail through campaigns.

When I checked the admin emails queue, all the mails keep getting stuck in the queue.

I tried to send mails from the queue manually, but without any success.

Since I use smtp, I checked the mail logs and found out that there is rcpt rejection.

I used tethereal for sniffing the exact traffic and what I can see is that the rcpt to header is empty (<> to be precise).

Is this a sugarcrm issue or am I doing something wrong? Is there something I can do to improve campaign mailing?

Using sugarcrm: 4.5.1

Kind regards,