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Apparently I installed that thing in 2006 and I last updated it in 2016, then I quit updating it for some reason that I totally forgot. Probably laziness...
It's been running for quite some time and we kind of forgot about it in the closet, until the SSH tunnel we use to get our mail outside our home stopped working because modern openssh clients refuse to use the antiquated key cipher I setup client machines with way back when any longer.
I just generated new keys with a more modern cipher that it understands (ecdsa-sha2-nistp256) and left it running. Because why not 🙂
Good thing there hasn't been any remotely exploitable security bugs in any of the mail system components in the 6 years since Debian 7 went EoL
https://security-tracker.debian.org/tracker/
Depending on how it was configured it may or not be have been compromised. Probably better to go the nuclear option.
Why? Then somebody else takes care that it still can send mails