Hello,
Unfortunately, this isn't a glitch, it's how auto-replies work. Auto-replies like mailbox full, vacation, out-of-office, no longer with company, we've received your message, etc. are triggered to send to the sending addresses, not to reply-to addresses, even when a different reply-to has been applied to the email.
Your Executive Driector may be able to work with your org's IT to get such auto-replies spam-filtered, but that isn't something we're able to assist with.
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