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I check not having this website blocked or in spam, or something. Anyone else?

It means what it says. To prevent my inbox from being filled with error messages about returned email, I wrote the safe_email() function to not send email to addresses I'm aware will not receive it. There is currently a problem with any Google address receiving email from our mail server, and it has not been fixed yet. If you want to continue receiving email, you should change your address to something with an email service that doesn't have a problem with accepting our email.

I actaully do not need that. But it is good to know it is not a bigger problem. Thanks!

I changed the "Fatal Error" to a "Warning". What I meant by fatal error was that the function stopped, but it actually means that the script has stopped, which wasn't the case. Calling it a warning should make it clearer that something merely went wrong with the email and that the script did not actually stop.

To be honest warning is much better than fatal error. That is what tipped me off.  It was an overkill in my opinion :)! So, nice change :)!