CDONTS, ASP Mailing HTML emails etc? can someone advise

Hi, this is really just a common question, that would benefit my understanding.

I have created a HTML bulk mailer using the component CDONTS. I do have a few issues with it, in terms of waiting. I am having to wait ages in order to finally recieve the HTML email.

Dont get me wrong I do end up getting the email, that has been sent to mulitple accounts but it just takes a long time. And especially when I need an immediate response in order to test and process the work, I cannot afford for such a slow wait.

A second question would be that this works great externally, i.e other email accounts, but for some reason the mac users in the office dont seem to get the email. And when they do if they do it crashes or just displays a white blank page.

Can anyone provide me with a little extra knowledge in this area please.

It would help me loads

Thanks

Trev