holch wrote: Well, if you separate it like this, this might help because the own servers might accept emails easier. Good point. I did never think about that.

However, those "Consumer"-Accounts are usually not made for mass emails and have loads of restrictions (not only the total limit per day, but many have hourly limits as well, etc.). So you need to make sure that you are not running into any of those limits.

Using VBA in Excel, I can do the following now:
1) set the email batch to 20
2) using VBA through limesurvey to send invitation or reminder every 10 minutes (or 15 minutes).
3) Then in one hour I can send 20*6=120 emails. 120*24=2880 emails per day.

the vba can send 2880 emails through limesurvey per day automatically. If I can use multi SMTP account, I think those emails will not block by Consumer server.



Thanks