try changing joomla global email settings, or contact your hoster.

fengle wrote:

beat wrote:

try changing joomla global email settings, or contact your hoster.

Can you give me more explanation? such as what I should ask for from my hoster?

My users can't send emails though CB email function, but they DO get emails including followings:
CB registration email
User reports
Connection request notifiation

And I just find out if I set the parameter "Emails sent "From:" " @CB backend to "admin-reply to-user" instead of user address,emails then can get through!

Yup. Right. Good find, thanks for sharing. That's why this setting is there for.

Explanation, also as reference to others who search forum:

1) Some hosters allow only emails to be sent from their server which have a "from" address with a domain-name which is hosted on their server.

2) Also some email-hosters accept emails only from a host which is in the "SPF" record of the corresponding domain-name.

Now that has a small privacy drawback, since bounced/returned-emails's subjects will be seen by the admin instead of the user. This is explained in the setting's explanation:

Setting for Send-to-User Email forms: Sender formating: Choose between:

1. "From:" User Email Address (no "Reply-To:" field):
   User receives all replies and error reports, for better privacy)
2. "From:" Admin Email Address, with "Reply-To": User Email Address:
   This is SPF spam-checking compliant, but admin may receive errors/erroneous replies

Anyway, good that you could find solution to the problem, and that it was already included in CB.