When Group mail is sending a message you can tell at all times what is going on.
Status: This shows what Group Mail is actually doing at that time.
Recipient Distribution Progress: This shows the progress of the complete job.
Message Delivery Progress: This shows the progress of the current message that is being sent out. If you're mailing in personal mode then this resets for each recipient. In bulk mode it resets after every split or reconnection.
Sent To: Shows the exact number of recipients that have received the message at that point in time.
Excluded: Shows the number of recipients who have been found to have entries on the Exclusion List or the Block file
Filtered: Show the number of recipients that have been excluded from the mailing by send filters that you setup while Preparing to Send the Message.
Errors: Shows the number of errors which have occurred so far. This includes errors generated by invalid recipients etc.
Time: Total Time take so far.
Session Details: This is a log of all the information that has been sent to and received from the Mail Server.
When you have finished sending your message the Send results section will appear. The most important feature of this are the logs that are available. You can see exactly who received the message, what errors occurred, which recipients were not mailed (and why - Errors, or because of Filters).
Use the drop down list to select which log you would like to view. Also you should save any logs that you wish to keep. Use the Save As button to do this. Group Mail will reset these logs for each mailing. The most important log is the Sent Log.
If for some reason your connection got terminated or your PC got powered down before you completed the mailing (if this happens, go to the Group Mail\Logs directory and retrieve the file there before restarting Group Mail, it will be called Sent.log) then you can use this file as a block file when you go to send the message again. This will help you avoid resending the same message over and over again to the same recipients. (see the Prepare to Send screen - Advanced Exclusion / Recovery tab for details on how to use this file).
** Notice: from version 3.4 all new messages sent in Group Mail can be resumed with one click from the Sent Messages tab. Just select the message and click the Resume button.