Bounced emails

Hello
I have been receiving this message for two of our members when sending emails using  members-3574@toastmastersclubs.org   -  has been doing this for about a week.
            This email address is being protected from spambots. You need JavaScript enabled to view it. was skipped because it has previously bounced too many times.This email address is being protected from spambots. You need JavaScript enabled to view it. was skipped because it has previously bounced too many times

Many thanks for your help

The Bounce Count for Email Address [cainesjulie@gmail.com] has been reset to zero.
The Bounce Count for Email Address [helen.brownlie8@bigpond.com] has been reset to zero.

These members are on your contact email and those may contain spam, when they receive emails that are spam make sure they are clicking "Is this spam" link at the bottom of the emails.