Warning about greylisting

In case anyone’s having mail trouble, note that the gnu.org mx is
acting odd, which doesn’t give me a warm fuzzy that it won’t do
further odd things. Greylisting is one thing, and I can certainly
understand that, but I don’t know how they think my NetBSD box running
postfix is windows. I haven’t noticed this before; usually my posts
to the list go through promptly.

-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
A64B75299 60851 Mon Jan 29 12:06:32 [email protected]
(host mx20.gnu.org[199.232.41.8] said: 451-You seem to be a Windows
machine. Our condolences. You’re greylisted for 20 451 minutes. Come
back later. (in reply to RCPT TO command))
[email protected]

311265297 1637 Mon Jan 29 12:01:11 [email protected]
(host mx20.gnu.org[199.232.41.8] said: 451-You seem to be a Windows
machine. Our condolences. You’re greylisted for 20 451 minutes. Come
back later. (in reply to RCPT TO command))
[email protected]

– 61 Kbytes in 2 Requests.