PKSupport -> Thanks for the response. I was able to send the final two addresses by switching browsers...from Chrome to FF. Clearing the cache, deleting, re-entering participants & email addresses had no effect in Chrome. Sigh.

We are using LS via 3rd party hosting service (Blue Host) so I am not entirely sure how upgrading works. This is our first time at the Lime Survey party. I will investigate upgrading and look for "the guide". Thanks for the tip.

Cheers,

I have the same problem. I have Version 2.00+ Build 130708 and I have it on my own server (not done by me). The thing is that it has worked like a charm to use it until a week ago. Now it refuses to send every mail. Tried to send to myself to but it ditn´t work. I can´t update it on my own and my prior computerguy isn´t available so if I can´t solve it I will have to abandon Limesurvey

@AnnaBH : then someone disable php mail function during the week.

But you can use any other way to send email : try SMTP for example : www.limesurvey.org/manual/Global_settings#Email_settings

Then I think I have to give up. I can´t find where I can do those settings. See the picture.