Site emails end up in users' spam folder
My server's has 2 sites on it, each is a forum.
In the last month all emails that are sent from the server are going to the spam folder of the users.
I've double checked at all spam databases - not listed.
The server has a valid reverse ptr record, valid spf (shows "pass" in the msg headers).

I tried something else- to have that server send emails from another server I own-
but again, all those emails that are originated from the bad servers are going to spam folder.

Can anyone point me to what should I check next??

Thanks!
Site emails end up in users' spam folder
===

My server's has 2 sites on it, each is a forum.
In the last month all emails that are sent from the server are going to the spam folder of the users.
I've double checked at all spam databases - not listed.
The server has a valid reverse ptr record, valid spf (shows "pass" in the msg headers).

I tried something else- to have that server send emails from another server I own-
but again, all those emails that are originated from the bad servers are going to spam folder.

Can anyone point me to what should I check next??

Thanks!