Use SMTP Relay to route outbound SES emails through to Exchange Online

Hi Everyone,

We currently use SES to send emails to recipients using our registered Route53 domain (say "noreply@ourcompany.co.uk"). We currently send emails to a client (such as "client@theclient.co.uk").

The client would like us to leverage a capability of sending emails through to their email distributions lists to multiple internal recipients, though the challenge we have here is that the distribution lists are not permitted to receive email from 'external' email senders.

The client's email capability is set up on Exchange Online, and I was seeking some advice whether it was at all possible to use an outbound SMTP relay to effectively route our emails from SES to the client's Exchange Online instance so that emails to the @theclient.co.uk would effectively be managed/received from an "internal" address.

Having looked through the documents for the SES SMTP relays, there seems to be multiple reference to managing inbound SMTP relays through Mail Manager, but I can't seem to find any clarity on routing outbound emails sent from SES through an SMTP Relay to another mail service such as Exchange.

I do hope that makes sense, and if anyone has any insights in whether this is indeed possible it would be much appreciated.

Many Thanks,