Hi
I have a web site that provides online services to members.

The web server sends out over 10000 emails every day to thousands of members who have opted in to receive email notifications and updates. Emails are sent only those members who have willingly selected in their control panel to receive email notifications. Each member who has opted in to receive notifications of updates to their accounts receives anywhere from 1-10 emails in a day. I believe this is not considered as spam as we only send emails to members who have asked us to.

I have lately observed and members have been complaining that any email from my web site ends up in the Bulk Mail / Junk Mail folder in Yahoo Mail, Hotmail, Gmail and Outlook. I am not sure why this is happening, I believe so that may be my domain has been black listed or such owing to the volume of around 10000 emails sent out every day

Can someone advice on what should I do so that this does not happen.

Any help or advice on this matter is appreciated.

Thanks