Email to our club president is bouncing

I am getting the following error when sending to our officers email list:

roy.sherrill@datalight.com was skipped because it has previously bounced too many times. Please visit support.toastmastersclubs.org and post a support request message for more information.

I will need your club number to complete the fix.

datalight.com is hosted in a server farm that has spammed our servers and the IP was blocked.

I have removed the block but it can happen again.

club number is 304.

he should now be getting email from the server

Apr 24 13:49:05 toastmastersclubs sendmail[26215]: x3ODn48t026211: to=<roy.sherrill@datalight.com>, ctladdr= (501/502), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=120780, relay=us-smtp-inbound-2.mimecast.com. [207.211.30.242], dsn=2.0.0, stat=Sent (SmtpThread-26288394-1556113745122@us-mta-233.us.mimecast.lan Received OK [4G8af0IKMTOKZhdZ6BIACQ.us233])