IMCAEX The recipient's e-mail address was not found in the recipient's e-mail system.

Check If your User have LegacyExchangeDN Attribute by using ADSIEDIT tool.





IF The Attribute has not been set then execute the Powershell command below;

Get-MailContact -OrganizationalUnit "OUNAME" -resultsize unlimited Where-Object { $_.legacyexchangedn -eq "" } Set-MailContact
Get-MailUser -OrganizationalUnit "OUNAME" -resultsize unlimited Where-Object { $_.legacyexchangedn -eq "" } Set-MailUser
Get-DistributionGroup -OrganizationalUnit "OUNAME" -resultsize unlimited Where-Object { $_.legacyexchangedn -eq "" } Set-DistributionGroup
Get-AddressList Set-AddressList
Get-AddressList Update-AddressList

Note: Instead OUNAME type your Organizational Unit name where your users resides.
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Client using Outlook 2007, Exchange 2007 Certificate Error on Cisco Router based network

If the Outlook 2007 clients and Exchange Server in your organisation are on a different subnets and router connecting these subnet is listening port 443 , the auto discover mode of Outlook 2007 and Exchange 2007 may fail because of DNS name resolution problem. Auto discover service allows your Outlook 2007 clients to retrieve the URLs that it needs to gain access to the new web services offered by Exchange 2007.
Cause of this failure is certification mismatch that outlook use to create secure connection channel between client and server.
Use "no ip http secure-server" command on Cisco router, to prevent router from listening https port.
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553 Message filtered

553 Message filtered

This Erro states that your emails are filtered by Spam Filter.

I suggest you to follow these steps below.


1) Check if your Email server' IP address is in Blacklists.
http://www.dnsstuff.com/ or http://www.mxtoolbox.com/

If your IP address is in blacklist(s) . Contact them to remove your address and try sending emails to domains that you get this error after 24 hours.

2)Check if your Email server is open relay.http://www.abuse.net/relay.html

3) Check if your emails contain SPAM content.

Don't ever send more then 250 emails concurrently to AOL
Don't EVER embed an image in an email
Don't use caps anywhere in your email, especially in your subject line
Don't send an email without checking your Spam trigger word content**
Don't use the word "remove," use "unsubscribe"
Don't start your subject line with "Dear..."
Don't use Spam software to send email
Don't use your PC as a server
Don't forge headers
Don't put ADV in your subject line
Don't send an email without checking to see if you or your ISP is on a Blacklist**
Don't over use punctuation (just one !)
Don't leave headers blank
Don't use BCC to send emails (and certainly not CC)
Don't over use Marketing Phrases**
Don't use the Priority option
Don't change the time on your server so your email stays on top of the heap
Don't overuse HyperLinks
Don't use a fake IP address to send email
Don't use HTML (sorry)
Don't waste time sending email without using e-filtrate ;) e-filtrate is an automated system that makes sense of all this.

source : http://www.e-filtrate.com/

4) Check your email server for virus or malicious software that can send SPAM


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