We have a website on a shared hosting along with webmails. We were not able to access the mail and the hosting provider gave us to an IP address with a port value. When asked about the email bouncing, he said "No, all your mails will have come and will be available at this IP". But, I am bit suspicious about this since there have been no mails for past 8-10 hours.
Is there a way to determine if the emails bounced back or the mail server was down during a particular timespan.