Re^2: Mail::Sendmail Module

This will have no effect. There is no "Auth" key mentioned anywhere in the documentation

Are you sure? The POD does not explicitly show $mail{Auth}, but it states:

Keys are NOT case-sensitive.

I see this in the sendmail code:

        # arrange keys case
        $k = ucfirst lc($k);
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I have a feeling that $mail{Auth} is the same as $mail{auth}.