Perhaps the mail id 'fefsdfdsf@gmail.com' exists and the mail is successfully sent to that address though it wasnt your intention ... unless of course your intention was spamming ;) ... So, it is important to first check for accuracy of your send list addresses ... and then you can check for a successful sending of the mail to the correct address using the code below which is given in the synopsis of the module you mentioned.

eval { $sender->send($email) };
die "Error sending email: $@" if $@;
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