password prompts

its the usual Outlook password prompts, with an error every now and again in the tasks windows. seems fine at the moment, so i cant paste an error.

seems to have been happening since yesterday, on domains based on mail1.
 
there's definitely an issue somewhere.
i am getting emails now that are 1 hr old.

one, a bounce message, came in as follows:

66.218.66.166 failed after I sent the message.
Remote host said: 451 timeout (#4.4.2)
I'm not going to try again; this message has been in the queue too long.

also, i have not got an auto-response for a ticket i sent in.

something's fishy...
 
Do you mean you still see password prompts?
In our monitoring system(per minute check) there has been no outage these hours.
 
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