Our Payroll server once a month sends emails to all staff with their Pay Advice. Up until now, this was only to internal Addresses.
Now there is the requirement to send to external addresses. However none appear to reach the external recipients. All internal emails are received without issue.
Email Server = Exchange 2010 (Win Svr 2008 R2)
Payroll Server = Win Svr 2008 R2
The Payroll Application does not have a mailbox attached to it. The Exchange Server address, SMTP port & the sender address are configured in the SMTP settings. (so the payroll app is not connected to a mailbox, it is just sending using an alias). The Sender address is just our Payroll officers email address.
I know that with this setup, you need to ensure the Payroll Server IP address is added to the SMTP Relay senders list for the Payroll server to be able to send internally, but how can I configure Exchange 2010 to make it send externally also? Is it possible?
I am unable to use the Exchange mail flow tools as the emails are not stored in any mailbox.