Special characters have to be escaped¹ (which is probably the search term you needed) with a backslash, as is done to the "@" in the first line below. (The bars in the second line are merely to make the printout show unambiguously what's in $ascalar.

$ascalar="myemail\@gmail.com";

print "\$ascalar is |" . $ascalar . "|\n";
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Output of the code above looks like this:

$ascalar is |myemail@gmail.com|

And, at the hastiest of scans of your update, neverminda, same answer. BTW, this is the kind of question that's a good argument for reading the docs.

¹ Belated Update: An excellent alternate -- use of appropriate quoting -- is well covered by others and should have been noted sooner, since my initial statement is incorrectly categorical. See the replies from Fletch & shmem below.