Sharepoint sends mail that goes in spam folder | Outlook 2010 / 2013 | Exchange 2010

exchange

A few days ago I received a request from a reader of my blog:

“I am a SharePoint Developer and not familiar with exchange server.  I will really appreciate if you can please help me on this:

Issue is that we are sending an email from our custom application in SharePoint to “ALLUsers” group which contains all the employees of the organization. This email is send via SharePoint using SPUtility.SendEmail method. Now, not all the times but some times emails goes to Junk E-mail folder. 
 
We have discussed this with IT and they said they have already added the IP address of our SharePoint Server into “whitelist”. After much discussion, they have send us following code to add it in our email:
 
objMessage.Configuration.Fields.Item(“http://schemas.microsoft.com/cdo/configuration/smtpauthenticate“) = cdoBasic objMessage.Configuration.Fields.Item(“http://schemas.microsoft.com/cdo/configuration/sendusername“) = “abc@dom.com” objMessage.Configuration.Fields.Item(“http://schemas.microsoft.com/cdo/configuration/sendpassword“) = “password_of_abc@dom.com“
 
I am not sure that this will work. Also, what else we can do? we are running “Exchange Server 2010 SP2 with Rollup #5” “
Solution:

#1. If the Exchange Server spam filter also filters the local relay then:

Probably they only white-listed the ip but that doesn’t make Exchange to also skip the anti-spam policy.
We are talking about a e-mail addresses that is on a server and when you try to send emails to addresses from the same server they go into junk.

To do that, they have to give this command in power-shell:

set-mailbox nameof.mailbox -AntispamBypassEnabled $true

get-mailbox nameof.mailbox | fl *spam*,*SCL*
AntispamBypassEnabled  : True
*replace nameofmailbox with the name of the account configured

#2 If the Exchange Server does not filter local relay for spam: 

You are sending a internal e-mail from a address to a list and it goes to spam but the exchange does not filter local relay.
Then you need to add a safe senders list via a GPO for everyone for Outlook. Because the problem is Outlook has it’s own mechanism for anti-spam.
( For testing before you do that: add this address to safe senders on one computer with Outlook and then send the mass message and see if it still goes to spam –> it should not ).
Tutorial how to make a GPO for this can be found here.

If you have problems / questions / ideas please you can comment here or contact me. 

Enjoy !

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