SMTP Client Authentication on Exchange 2016? (SMTP Relay)
Hello all, Is it possible to setup SMTP Relay on Exchange 2016 to allow authentication from applications outside of our network? For example, let's say we have an ERP software that's installed on a server that is located on a new site that is outside of our network. The server in question isn't joined to our domain yet (recently acquired company). They no longer have an Exchange server. Can our Exchange server be used as their SMTP server to send out invoices? I know this would work with Exchange Online/Office 365 as it allows you to enable SMTP AUTH for specific mailboxes. But I'm not so sure if this would work with an on-premise Exchange server. PS. I tried creating an SMTP Relay on our on-premise Exchange and whitelisted the site's IP Address. We're trying to authenticate using our webmail address. We get error 10060. Any help would be appreciated. Thanks.