In the UK if your sending more than +100 emails, you will find your ISP will more than likely block them as spam.
If say hotmail receives say +50 expect to be blocked as a spam merchant, and enjoy the fun of convincing them otherwise.
Sending emails via the forums just does not work as intended.
I agree with everything Gizmo has said.
Its not great being black listed.
I would not advise using it for mass mail. Even the batches of 20 become tiresome if your doing it manually, and easy to loose track.
An admin internal mass pm would serve a better notice.
Or create a global announcement.
I cant even use the system to verify a user's email account due to domestic ISP seeing our forum as mass mailer. (not because of newsletters but watched topics, members and alike being sent out)
For me e-mail in the forum environment is almost but dead, it's just unreliable. As members whom try to do a password reset, they never get it, it's generated by the forums but bounces at the ISP.
I Strongly advise not sending mass emails.
