Ubuntu – What minimal SMTP client will allow me to relay cron output to an external email address

I don't know where SharePoint gets its list of email recipients, but the following should do what you want on the Exchange side:

• Remove the "SomeEmail@gmail.com" address from the AD user account if you haven't already.

• Create a mail-enbled contact object in the Active Directory and assign it the email address "SomeEmail@gmail.com".

• Add the newly-created contact as an alternative delivery recipient on the "Exchange General" tab of the user's properties by clicking "Delivery Options", selecting the "Forward To" radio button, clicking "Modify", and choosing the newly-created contact from the AD. Optionally check the "Deliver messages to both forwarding address and mailbox" if you so choose.

That will get Exchange to deliver mail to that user to an external email address.

Create /etc/postfix/virtual-regexp with the following content:

/.+@.+/ email@gmail.com

Edit /etc/postfix/main.cf and add the file to virtual_alias_maps. The end result might look like this:

virtual_alias_maps = regexp:/etc/postfix/virtual-regexp

If you had existing virtual_alias_maps, separate the values with commas (eg. virtual_alias_maps = hash:/etc/postfix/virtual, regexp:/etc/postfix/virtual-regexp).

Build the mapfile by typing:

postmap /etc/postfix/virtual-regexp

Then restart postfix :

sudo service postfix restart

Voila!