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Exchange event id 3005

Unexpected Exchange mailbox Server error: Server: [server.domain.com] User: [user@domain.com] HTTP status code: [503]. Verify that the Exchange mailbox Server is working correctly.

I have users that can't receive email, we are in the middle of a migration to O365. We have been moving mail over for about a week now, and this just started happening yesterday.

Does anyone have a possible fix for this?
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ForzaSupport
Asked:
ForzaSupport
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1 Solution
 
Thomas GrassiSystems AdministratorCommented:
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Alan HardistyCommented:
The error itself isn't necessarily one to worry about.

What is the problem with receiving mail?
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ForzaSupportAuthor Commented:
I do not know what the problem is. I have a couple users who cannot receive mail. I cannot figure out why. I think it is directly connected to our migration to the cloud but I cannot be sure.

Right now only one user cannot receive mail. Last night it was 2 users. It seems to change every day.
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Alan HardistyCommented:
Okay - the 3005 error is more of an Activesync error, so if they can't receive via their mobile devices, then I would worry about the error, otherwise, that isn't related to the mail-flow issue and I would ignore it.

Are the problem users migrated to O365 yet or still local?

Is the problem receiving an internal problem only or an internal and external problem, or just an external problem?

Alan
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ForzaSupportAuthor Commented:
It seems to be just an external problem. I have gotten no complaints of anyone not receiving mail internally.

They are still receiving mail locally, they are not yet moved to the cloud.

Activesync seems to be the problem, Ive got hundreds of error-3005's in event viewer.

Any quick fix?
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Alan HardistyCommented:
No - there are no quick fixes for the 3005 errors as there are many different reasons for them.

Unless the users listed in the errors are having problems, I would ignore them, especially as you are migrating away from the server.
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ForzaSupportAuthor Commented:
im sorry I should have clarified, the users in the errors are the ones having the problem. Right now its over one user. Each error over the past few hours has that users email in it.
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Alan HardistyCommented:
Okay - and are they using a mobile device to access their emails?
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ForzaSupportAuthor Commented:
3 users access mail through their mobile devices. Those 3 users are having problems receiving/sending mail from exchange.
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Alan HardistyCommented:
Okay - what is the FQDN that the mobile devices / SSL certificate on your server are configured for to make Activesync work and does that FQDN still point to your server?
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