Email With Qr Code Gallery

I have tried to follow the instructions in the manual about email issues with galleries.  I have a handful of families that received the emails with the QR codes but 90% seem to not have received the emails.  Any help or advice would be appreciated.  I do not want to have to send out individual emails all night.  

Did you set up the SMTP PHPMailer as shown on this page?

Use SMTP PHPMailer If You Are Still Having Issues

In Settings -> Mail Sending Settings there is an option for the standard mail() function which is the default option.

There is also a PHPMailer option which uses the actual mail servers to send the emails and has a better chance of getting into inboxes. 

Instructions here for setting up PHPMailer.

It seems like it really depends on your ISP (or email provider).  My ISP had  old email server/software, and all that I had was problems with emails from my Sytist software...He recently upgraded server and software and all is good.  Everything goes where it should, almost immediately.