Messages about invalid emails bouncing club 643557 and 5265 and 7260180

The message March 30 a number of times as follows Emails sent to primary email address (jorge.ducharme@stantec.com) and (athayde@shaw.com) have bounced too many times and exceeded the Free Toast Host limit for bounces,

This automatically generated message is to let you know that this email address has been removed from the FreeToastHost data base to prevent further bounces If you re able to resolve the issue with the email address, you will need to reenter it in the system.

There is no issue that either of these members can discover. Jorge has checked with his sys admin and there were no changes made to cause this to happen. Thecla has had no issues occur for any previously sent emails and I re-inputted both of them in all three clubs, but it is happening again. Can you please help?

The Bounce Count for Email Address [jorge.ducharme@stantec.com] has been reset to zero.

Apr 5 20:50:27 toastmastersclubs sendmail[15565]: 135KoQCS015562: to=<jorge.ducharme@stantec.com>, ctladdr= (501/502), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=121229, relay=mx1.stantec.iphmx.com. [68.232.140.132], dsn=2.0.0, stat=Sent (ok: Message 110961117 accepted)

I believe the other email is athayde@shaw.ca and was not blocked.

Apr 5 20:52:19 toastmastersclubs sendmail[16474]: 135KqF8d016461: to=<athayde@shaw.ca>, ctladdr= (501/502), delay=00:00:02, xdelay=00:00:02, mailer=esmtp, pri=133104, relay=smtp.glb.shawcable.net. [64.59.136.136], dsn=2.0.0, stat=Sent (TWCnlJJfXnUUHTWCplJqA7 mail accepted for delivery)

They were both blocked and emails removed from all three clubs. I had re-inputted emails in all FTH club sites and sent out info to all members and Jorge bounced again! Thank you for looking into this! I hope we will be OK from now on.