Since 8 months ago, I've been using SME server 7.1.3, since I installed it, I didn't have any problem, but two weeks ago I got a problem. The problem is that when users receive incoming mails, the mails arrived doubled or tripled but just some mails not all of them. In order to discard that is not O Look Express, I checked my email account by Web Mail and it happens the same with some emails.
I've also realized that in some accounts it takes long time the mail that I try to send in coming up, after more less 20 or 25 minutes the mail arrives to the recipient but that problem is not constant.
Can anyone tell me why this is happening?