54
votes
Good idea? Refuse incoming emails with our own domain ending? (because they must be fake)
Yes, if you know that email for your domain should only be coming from your own server, then you should block any email for that domain originating from a different server. Even if the sender's email ...
- 826
32
votes
Good idea? Refuse incoming emails with our own domain ending? (because they must be fake)
There is a standard for doing this already. It's called DMARC. You implement it with DKIM signing (which is a good idea to implement anyway).
The high level overview is you sign every single email ...
- 69.1k
11
votes
Good idea? Refuse incoming emails with our own domain ending? (because they must be fake)
Such a block is likely to reduce spam and possiblly make social engineering harder but it may also block legitimate mail. Examples include mail forwarding services, mailing lists, users with ...
- 4,296
10
votes
Accepted
How to determine if remote wipe succeeded?
As written in the MS documentation here:
The remote device wipe feature also includes a confirmation function
that writes a time stamp in the sync state data of the user's mailbox.
This time ...
- 2,888
7
votes
Accepted
Displaying an Business 2 or Notes field in Outlook contact card company wide?
In AD Users and Computers, use the Attribute Editor to populate a field with the user's extension.
Edit: To enable Attribute Editor:
Open AD Users and Computers
Click View -> Advanced Features (...
- 3,267
6
votes
Accepted
Where is the global address list stored in AD?
In ADSIEDIT:
Configuration [.contoso.com]
◦CN=Configuration,DC=contoso,DC=com
◦CN=Services
◦CN=Microsoft Exchange
◦CN=OrganizationName
◦CN=Address Lists Container
◦CN=All Global Address Lists
...
- 17.1k
6
votes
Accepted
Outlook Web Access, Exchange 2013, Malware
No, opening the message through OWA wouldn't have any impact on your Exchange database.
Are you using any sort of spam filtering solution in your environment? If not, you should be... Basically, you ...
- 198k
6
votes
Accepted
Will a mailbox user know their mailbox has litigation hold?
Litigation hold and In-place hold are transparent to the user, so they will not know they are on hold.
https://technet.microsoft.com/en-us/library/ff637980(v=exchg.160).aspx
- 3,272
5
votes
Accepted
how to backup/export office 365 email to pst in exchange hybrid environment?
You can't export Exchange Online mailbox directly to PST via PowerShell with built-in tools. Required New-MailboxExportRequest doesn't exist Online (or is not exposed to us mortals).
You can:
...
- 1,543
5
votes
Accepted
Reserve Email Addresses for old users within Exchange organization
Delete the mailbox and user account.
Create a Distribution Group and name it using a name that describes it's purpose (like Placeholder or something to that effect), then hide it from the Address ...
- 111k
4
votes
Accepted
Server 2012, Server Manager Dashboard
Click the Services dropdown and uncheck the services that you don't want to see/be alerted on.
- 111k
4
votes
How to delete mailbox from database and release the storage?
Deleting the mailboxes isn't going to reduce the size of the mailbox database file. You need to perform an offline defrag of the mailbox database to shrink the file. You might be better off moving all ...
- 111k
4
votes
Accepted
Exchange 2013 DAG Cluster Unable to add second sever
Mixed OS version clusters are not supported. Get all of your servers on the same version.
See: Planning for high availability and site resilience (Microsoft Technet)
Each member of a DAG must be ...
- 23.2k
4
votes
Slow SMTP responses with Exchange 2013 (Not network infra related)
The behavior you are witnessing might be a security feature called SMTP Tarpit. It slows SMTP responses on purpose to mitigate some attack types, like directory harvest attacks.
The setting is ...
- 2,040
4
votes
Slow SMTP responses with Exchange 2013 (Not network infra related)
A delay measured in seconds is often a timeout with a request to a third party. So something like a reverse DNS lookup of the incoming IP, or checking against a dead RBL also.
You can easily miss this ...
- 1,256
3
votes
Accepted
Exchange2013 unable to remove empty database
The error message is close to useless, as half of what it refers isn't available in on premise installations.
Run through the following commands:
get-mailbox -database "DatabaseName"
get-mailbox -...
- 2,884
3
votes
Accepted
Recover deleted mailbox and user- no AD recycle bin
You can't restore the mailbox by restoring the user account. If you don't have a backup of the mailbox then see this link:
https://technet.microsoft.com/en-us/library/jj863438(v=exchg.150).aspx
You ...
- 111k
3
votes
Good idea? Refuse incoming emails with our own domain ending? (because they must be fake)
Maybe, but there are some cases you need to consider before you make such a change.
1) Does anybody in your company use any kind of external service (for example Survey Monkey, Constant Contact, etc.)...
- 251
3
votes
How to create a script for Exchange Powershell to modify settings for all shared mailboxes?
Use Get-Mailbox, pass the result to Set-Mailbox. Here's a oneliner
Get-Mailbox -Filter { <put your filter here> } | % { Set-Mailbox -MessageCopyForSentAsEnabled $True -...
- 870
3
votes
Accepted
Running Exchange Powershell script from a batch file: command doesn't work. What's wrong with my syntax?
Try this (added dotsourcing of the second script):
PowerShell.exe -noexit -command ". 'C:\Program Files\Microsoft\Exchange Server\V15\bin\RemoteExchange.ps1'; Connect-ExchangeServer -auto; . 'C:\...
- 296
3
votes
Accepted
AutoDiscover with multiple accepted domains
SRV record or HTTP redirect is the way to go here.
For the SRV record, you need to ensure that Autodiscover.example.com does NOT resolve.
That will mean checking there is no wildcard in the domain, ...
- 2,884
3
votes
How does Exchange handle SSL certificates?
You cannot have multiple certificates for all services. However for Receive Connectors it uses a match on the FQDN. Therefore if you set the FQDN to mail.example.com then you need to have an SSL ...
- 2,884
3
votes
Accepted
When integrity of an Exchange 2013 mailbox database is questionable, is it safe to simply "move" the mailboxes, or do they have to be exported?
There is no size limit for mailboxes with the New-MoveRequest command.
I would highly recommend using this tool before trying to perform an export/import of PSTs. Move requests are very simple, and ...
- 3,469
3
votes
Accepted
On-premises mailboxes cannot receive emails from 365 Hybrid deployment
According to your description, if the user login Office 365 OWA, he can see the email, we could know that the mail flow is working fine. And now this issue we need to confirm is the type of mail flow, ...
- 824
3
votes
Blocking recurring meetings for Room Mailbox
AllowRecurringMeetings : True
Have you tried setting this to False?
Set-CalendarProcessing -AllowRecurringMeetings
The AllowRecurringMeetings parameter specifies whether to allow
recurring ...
- 49.8k
3
votes
Calculate size difference between two Exchange mailboxes
TotalItemSize is not a number, the property has two members:
[PS] C:\Windows\system32>(Get-MailboxStatistics administrator).totalitemsize
IsUnlimited Value
----------- -----
False 690.4 KB (...
3
votes
Accepted
What's a reasonable max number of users I should put in a mail-enabled security group?
Not for most organizations, and 3,000 isn't enough to cause problems.
Prior to Active Directory 2003, when a member was added/removed to/from a group the entire group membership was re-replicated. ...
- 36.8k
3
votes
Accepted
Using EWS to access O365 mailbox
Do you deploy hybrid? Or just sync via AAD connect? Do you deploy ADFS?
Browse to https://testconnectivity.microsoft.com. This is a Microsoft-owned tool.
If using Office 365, click on the Office 365 ...
- 824
2
votes
why am i Forced to increase Exchange 2013 attachment size to 100MB to be able to receive 10MB attachment
Base64 coding grows the size of attached file by arround 1.3. So if you want to send a 10MB file, the email will be arround 13MB plus the headers and the body part. So, you need 15MB minimum.
You ...
- 6,793
2
votes
Can't mount Exchange 2013 Database
It sounds like the exchange server can't see a domain controller. You don't want it connecting to a live DC for this kind of thing to be honest.
This is a terrible idea for a "fail-over" solution. ...
- 32k
Only top scored, non community-wiki answers of a minimum length are eligible