Second Email in Autoresponder Failed to Send

Second Email in Autoresponder Failed to Send

Hi, I have an autoresponder active with 3 approved messages.  I also have configured Campaigns to request a subscription confirmation.

I just entered a test subscription.  I successfully received the email confirmation request (which I confirmed) and then successfully received the first email, which was scheduled to send immediately after one joins the list.  However, I have two additional emails in this autoresponder (both have had their messages approved).  The second is scheduled to send 1 hour after joining the mailing list, and the third is scheduled to send 2 hours after joining the mailing list.  I did not receive the second (It's been an hour and 30 minutes since my test subscription.)  The third email is, as I write this, not yet due.

How can I troubleshoot to see why I did not receive the second email?

Thanks.


UPDATE:  The second email was sent after 1 hour and 32 minutes rather than right after 60 minutes.  Is it common for there to be a half hour or so lag?