To disable the warning for those two variable: 

# Prevent "used only once" warning for these variables.
$Mail::SendMail::error = $Mail::SendMail::error;
$Mail::SendMail::log   = $Mail::SendMail::log;

[download]

To disable the warning for all variables: 

no warnings 'once';

[download]

Update: There actually is a typo! $Mail::SendMail::... should be $Mail::Sendmail::....

In reply to Re: Strict error on var when using Mail::SendMail by ikegami
in thread Strict error on var when using Mail::SendMail by davidov0009

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