Just an aside, you can ignore the dot on your email, or add as many as you like. Google ignores periods on email addresses. Just google it... :D
This can be helpful if you're interested in tracking the origins of where your received emails come from. For instance, if you sign up your address at a website and start recieving sketchy emails with a destination for myemail+thatwebsite[at]gmail, you can easily find out where the leakage occurred.
The GMail specific feature is adding dots as you want in your mail localpart so (foobar, f.oo.bar, f.o.o.b.a.r etc @gmail are the very same mailbox).
So apparently my email address is lastname.firstname@gmail.com (firstname.lastname@gmail.com was already taken) and this guy has lastnamefirstname@gmail.com.
How cool that GMail ignores dots in the middle, right ?
Sometimes I wonder if he is receiving my emails, because I often receive his emails. I tried and forwarded him his email, GMail was stupid enough to deliver them back to my inbox.
The "ignore the dots in the middle" is truly a major google brain fart.
This is to say... Like, Just, be aware of this.
I created an account for my daughter that had this issue and it was really messed up; we can see emails sent and received by another person which included a bunch of personal information; job application conversations, flight details, etc...
We ended up just switching our daughter to a new address, but if we had a more malicious nature; this is a big security issue.
Thanks you for understanding.
You should be able to receive emails at last.nam.e.fir.stn.ame@gmail.com too
Try it
I can only assume there are small differences in the actual addresses and the senders are careless when typing in the "to" field.