Unable send mails in campaign it shows inprocess

We are using google for our mail sender. Yesterday we are able to sent mail to 506 users then in mail queue all remaining 91 messages goes to in process status. Today when we checked there are no mails in queue and when we checked sent items no mails are there sent on today. WHen we checked the Campaign status it shows these remaining 91 messages in Bounced/Other status.

Please let me know what this status is?, Also we created a new target list from these users are again created a campaign and tried to send the mails but its still status is Inprocess and mails are not sending. Please let us know how we can send mails to these people?

Can anyone please help on this

Thanks
Geo