I use gmail and I'm aware that a search could find some comment / details in my emails which are not addressed to the search instigator.

Also aware that there's 'set ups' which block anybody who is not an addressee from getting into my emails, but the details of these ups is daunting,

Does any member use a 'private email' set up and does it work but is it daunting to set up for every outgoing email?

Further, there's one specific email address I would like to block from searching my emails and/or blocking that email address from contacting me.

The person involved is my ex wife who I was divorced from and settlement completed over 50 years ago. Suddenly she has found my email address, it seems by just searching my name, and she wants now, after 50 years of no contact, to discuss old matters.

Is there a way I can block her from delving into my current e.mails?

Nobody can read your emails.

Think of the email address as a phone number.

If someone sees your phone number written down, they can't listen in on your phone calls.

It's the same with email.

As ukrules says, nobody but you can access and search your emails, unless they have access to your computer. Google may show you search results from your emails but it is only you that can see those results.

As for blocking emails from your ex wife: In Gmail, open an email from your ex, click the menu button with the three dots above the email, and you now have the option to block the sender.

22 minutes ago, scorecard said:

Suddenly she has found my email address, it seems by just searching my name, and she wants now, after 50 years of no contact, to discuss old matters.

Well just ignore her..same as if she found your new home address and sent you loads of

postal letters that arrived in your mail box.

Perhaps after 50 years you have some old matters to discuss with her too.

26 minutes ago, scorecard said:

Is there a way I can block her from delving into my current e.mails?

no she can't read your emails you can if you want send her emails strait to your 'spam'

or 'trash' folder.. but maybe she has something important to talk to you about ????