I have my own servers set up hosting my sites, and I have my own SMTP server which only I can access. I am planning to send an email to the 90,000 business contacts in my directory with a special offer but I am worried about doing harm to my STMP servers status in the global community. I know that if I sent out 90,000 emails through my ISP, my ISP would stop them and call it spam. My question is, if I am sending them through my own SMTP server, are there any negative effects, like will other SMTP servers pick up that I am sending a bulk email, and black list my SMTP server? I have written a program to auto create the emails and customise them to each of my clients, so I can drip feed the emails over the next few weeks but I would rather just do it the one time. Any ideas?