Duplicate e-mails sent to users
I have a problem with users getting spammed with 18 e-mails that looks the same when they have an comment added to their ad, or if they subscribe to a category, and someone uploads a new ad. I am not able to verify this bug myself, but I tend to get 2 emails. A lot of users report this 18 emails problem, so I am wondering if this can be a software (PPC) problem, a cron job problem, a mail server problem or configuration problem.
The problems started when I moved to a Ubuntu server, and both PPC and vBulletin are updated with latest version.
Any help would be greatly appreciated!