hiyohiyo I've tried various Gmail settings trying to get this to work without out success. There appears no way to get it to send an email. I keep getting a message saying "Must Start TIs First" whatever that means. On a server this just makes the program useless for monitoring purposes. More work needs to be donme on fixing what is a pre-requisite alert feature.
Multiple attempts to send a test email results in "Must issue start TLs First" - a fix for this would be greatly appreciated.
You need to go to your gmail account, you will receive an email saying an application is trying to connect and it's unsafe. You can enable a setting to allow applications and enable less secure connections.
Don't forget to use an app password if your gmail email id uses 2FA!
The entire reason to use this software is for the email alerts and it does not work. After 4 hours of error messages after trying Gmail, Yahoo, and others with every possible configuration, I have to move on elsewhere. It's a shame to have a nice program otherwise, but have poor functionality with little to no explanation as to why it fails and no online documentation. Waste of time!
I will improve send mail feature in Ver.9.
hiyohiyo 
CrystalDiskInfo
I would like to suggest two updates to the e-mail alerts feature:-
1. I run an IT support business in the UK and I install CrystalDiskInfo on all my customer's computers in resident mode with e-mail alerts. When CrystalDiskInfo generates an e-mail alert to my e-mail address, the only identifying information is the hostname of the computer, which is often rather vague. Could we please have an extra field in the e-mail settings where you can enter some freeform identification information to be sent as an extra field in the message? That way when I receive an alert, I'll know exactly who it is, so I can arrange to look into a possible hard drive issue.
2. When I was initially setting up the e-mail alerts I had a lot of problems getting it working with "known good" e-mail server settings. I got it working in the end using alternative servers after a "trial and error" exercise. What would be useful, when running the "test message" feature, would be a verbose report on the email sending process, to help in diagnosing problems.
CrystalDiskInfo is an excellent hard drive monitoring tool. Keep up the good work.
D Hale david@dhcomputing.co.uk