Mail from iMAC

[#1]

The Mail set up using iMAC OS10.14.3 makes no mention of relay.force9.net. Is that going to be a problem?

[#2]

(edited to remove complete tosh !)

Read https://community.plus.net/t5/Email/How-to-change-your-outgoing-server-on-a-mail-client/td-p/1606155

which should give you everything you need to know.

[#3]

Hi there, that should be fine. You'll only use relay.force9.net if you've got a force9.co.uk email address (as opposed to plus.com). If you have any further queries regarding this or anything else please feel free to let us know.