Did you do see the note in the AuthSMTP instructions:
IMPORTANT: If you do wish to send your messages using SSL you will also need to login to the Control Panel and enable SSL on your account.
Can I suggest you start without TLS just to get it going? Once it is going then play with TLS.
Just directly connect the laptop to the ClearOS LAN (or via the router LAN). You will probably have to give the laptop a static IP on the same subnet as the LAN. On Windows, go to the Control Panel > Network and Sharing Centre > Connections > Properties > Internet Protocol Version 4 (TCP/IPv4) (double-click or properties) > Use the Following IP Address. I'm sure there are easier ways in!
I can't remember if it can be done easily from the console. There is a really ugly way, which you can try if this does not work.
A DHCP server hands out IP addresses. A DHCP client receives its address from a DHCP Server.
The LAN should be configured as Static. Configuring it as DHCP means it gets its address by DHCP which is not what you want. Separately you configure you LAN NIC to be a DHCP server (Webconfig > Network > Infrastructure > DHCP Server).
Does this help?
I'm afraid I am not totally clear what you're after. Whether to WAN is static or dynamic has no effect on your LAN, so, for a first pass, everything will work as normal.
Where some confusion exists is that you've posted the question in the Static IPsec VPN for Home section of the forum. Are you trying to configure an IPsec VPN as well, as this is not done quite the same way.
Is your new LTE WAN IP address a public one or private - private ones are in the subnets 10.0.0.0/8, 172.16.0.0/12 or 192.168.0.0/16.
It can be done and is not too difficult.
Firstly some/many ISP's let you relay out via their own SMTP server, and if it is not authenticated it is trivial to set up - just use the Relay Host in the Webconfig SMTP Server. If they require authentication, see this doc. You can do per-user authentication but it is a PITA to set up and you will need everybody's passwords. If you relay via your ISP and they use authentication, be aware that some of them rewrite the "from" to the user who authenticated which forces you down the per-user authentication route. GMail does this, as to others.
However, from the link I gave you, can also relay via any service provider like your AuthSMTP.com.
If you get your domain from ClearOS they provide MX backup in case your server goes down and it provides up to a week of backup. I did suggest to them they could perhaps also allow SMTP relaying with that subscription but they said lack of demand for it did not make it viable. I'd have used it!
BTW, if you have a dynamic IP from your ISP it is generally not a good idea to send out e-mails directly from your own SMTP server as some spam blacklists automatically contain all dynamic IP's
Mount bind does not move files. It is closer to a symlink, but a symlink would allow you to view everything under the symlink alongside other items where you've placed the symlink. Mount bind "fools" the filesystem into thinking that, in your case, the contents of /home is actually directly in the flexshare. It will also still be accessible from /home. Have a go. Create a flexshare for your admins (don't put anything in it for the moment as it will disappear) then issue the command from the command line:to reverse it do:To make it permanent you need to edit /etc/fstab and the line will look a bit different.
I am not sure how well this will play with permissions. You'll have to play. Check that any file placed in someone's home folder by the admin can be seen, read and written to by the user. It may not be writeable.
Alternatively you can create a normal samba share of /home. This would be outside the flexshare system but it uses the same underlying package and would have the same permission problems.