I have a large customer whose business has grown, and as such so has their outgoing email volume. This is in the real estate industry, so there is a lot of email going out to every ISP under the sun. I have been dealing with deliverability issues and occasionally some ISPs like MSN blocking our IP for too much mail, which then affects all of my other customers and myself included since everything is sent out through the same IP.
To fix this for this client, we are moving to sendgrid for our outgoing email for this ONE domain which will have it's own IP. This is fine for the clients to set up the outgoing server in their individual email clients, but it is not fine for outgoing email originating from the server since that uses the servers mail instead of sendgrids.
I see no option to allow an individual virtual host to use separate incoming/outgoing SMTP servers. I see you can set up postfix to use a different server, but I don't want that for all email for all domains on the server. I only want it for this one virtual domain. How can I accomplish this?
Thanks, Steve Heinsch