Hi,

in our environment we are generating email from our internal application.

Mails are going to the users, but when we open in outlook we are getting error as

"this might be a phishing message and is potentially unsafe outlook 2010". the email is valid internal application mail

How to make that mail come as

Hi,

Awaiting Reply.

Hi,

Add the sending address to the Outlook safe senders list - can be done using group policy

Leif

• Marked as answer by Simon_WuMicrosoft contingent staff, Moderator Wednesday, September 11, 2013 6:20 PM

Add the IP address of the line of business application to the Exchange trusted SMTP list

Set-TransportConfig -InternalSMTPServers 192.168.0.0/24

Obviously changing the network range(s) to suit. This range should be all the IP addresses that you trust - so not just the Exchange servers in the DMZ (as the docs say).

Optionally, get the LOB app to do authenticated email. Authenticated email is never checked for spam. Or make a dedicated receive connector that has the Bypass Spam Filtering permission set on it.

Brian

Internal messages are those that are generated by an authenticated mailbox.

Simply sending SMTP messages from an internal server are not considered internal, they are external to Exchange.

Your application would need to either send via MAPI, IMAP mailbox connection, or authenticate via SMTP using a valid mailbox credential and email address.