One of my users is seeing repeated fails to send to hosted mail for nsf.gov 
from qwest.net:

first MX:

>>>> ... while talking to stn-mtpe-01-03-p.inet.qwest.net.:
>>>>>>> DATA
>>>> <<< 451 4.3.2 Please try again later
>>>> <[email protected]>... Deferred: 451 4.3.2 Please try again later
>>>> <<< 503 5.0.0 Need RCPT (recipient)

second MX:

>>>> ... while talking to cec-mtpe-01-03-p.inet.qwest.net.:
>>>>>>> DATA
>>>> <<< 554 5.7.1 Access denied
>>>> 554 5.0.0 Service unavailable
>>>> <<< 503 5.0.0 Need RCPT (recipient)

Between the first MX sending back two conflicting replies to one DATA,
and the second one apparently not accepting mail that it should, it looks like
there's multiple places needing some percussive maintenance....

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