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Disable and remove X400 from Exchange 2010

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Last Modified: 2018-02-06
Hi all,

We have an Exchange 2010 environment that was previously migrated from Exchange 2003 and we still have X400/500 set on some user accounts as also distribution/security groups.

What is the best way to stop X400? Is there a generic way to stop the protocol or shall we use scripts to remove X400 addresses from users and groups?

Once we remove X400 and a user replies to an old email will any impact from client side? Will they receive any error?

Thanks.
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Jian An LimSolutions Architect
CERTIFIED EXPERT
Top Expert 2016

Commented:
if you don't have legacy application that used X400, you just use a script to remove the X400.

and if you worry too much, just remove a few and see. Usually we haven't seen any major issues on X400. and new email should use X500 by now if you are on Exchange 2010 for a while.

Please do not removed X500.
Tom CieslikIT Engineer
CERTIFIED EXPERT
Distinguished Expert 2017

Commented:
You can check who is using X400 and if you'll find you don't need it you can remove it

Get-Mailbox -ResultSize Unlimited | Where {$_.EmailAddresses -like "X400:*"}

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You can run script to remove X400

$Recipients = Get-Mailbox -ResultSize Unlimited | Where {$_.EmailAddresses -like "X400:*"}
foreach ($Recipient in $Recipients)
{
[array]$AllEmailAddresses = $Recipient.EmailAddresses
[array]$NoX400Addresses = $Recipient.EmailAddresses | Where {$_ -notlike "X400:*"} 
Set-Mailbox -Identity $Recipient.Identity -EmailAddresses $NoX400Addresses 
}

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"Batchelor", Developer and EE Topic Advisor
CERTIFIED EXPERT
Top Expert 2015
Commented:
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Author

Commented:
Hi all,

Can someone answer my question.

Once we remove X400 via scripts and a user replies to an old email will any impact from client side? Will they receive any error?
Qlemo"Batchelor", Developer and EE Topic Advisor
CERTIFIED EXPERT
Top Expert 2015

Commented:
I've answered that in the comment to get accepted.

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