Hello,

   I currently have a user that is receiving the error code 50 when he tries to send e-mails to his recipients that are part of an e-mail list.  We're using an exchange server for our e-mail system.  We initially thought the format of the e-mail list was wrong and we also made sure that all of the recipients e-mail address are separated with a semicolon. This issue occurs at random times.  We've tried reinstalling the Outlook client and installing the latest updates.  Our organization also uses the web-based e-mail system as well and he never gets any error code when he is sending e-mails using the web-based client.  Any suggestions or troubleshooting tips that I can perform on my end?

Thank you.