> I'm Irish and have a common firstname.lastname@gmail.com
At the risk of nitpicking, @gmail.com email addresses use a dots don't matter policy [0] so really you have a common firstnamelastname@gmail.com and are free to add dots wherever you like.
Recently learned, to my surprise, that other major providers have not followed Google’s lead on this, so there are plenty of places dont.scam..me@ is a valid email (social engineering or typosquatting).
At the risk of nitpicking, @gmail.com email addresses use a dots don't matter policy [0] so really you have a common firstnamelastname@gmail.com and are free to add dots wherever you like.
[0] https://support.google.com/mail/answer/7436150