Sonicwall Firewall 2040 Standard OS - Webmail Issue

Due to a power issue last week, our SonicWALL NSA3500 with the enhanced OS got fried and we had to resort to an older model with the standard OS until the new unit arrives. The problem relates to setting up the older unit to be able to access our webmail from outside the organization. On the inside of the firewall we can use a browser to access but this does not work outside the firewall. The one to one NAT is configured with the proper WAN and LAN addresses as per our MX record pointers. Is there an access rule that is required along with the NAT policy?
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Amit KumarCommented:
You need to open inbound 443 port to get this running.

MX records works with inbound 25 port.

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David AtkinTechnical DirectorCommented:
You best option here would be to use the 'Public Server Wizard'.  It will add the NAT Rules for you.

Amit is correct about port 443 - Its the only thing you need to open for OWA.
Outside the network, when you attempt to access do you get a sonicwall login?

If so, change the login ports on the sonicwall.  

On standard OS (really old so I am trying to remember correctly), you do have to add firewall rules on the 1-1NAT.
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GeneratorAuthor Commented:
When I try to access the webmail from outside the network I do not get SonicWALL login. Could I get an example of the access rule that would be required to open port 443.
Source: any
Destination: mail server internal ip
Rule: https

What version of sonic os is on there?
GeneratorAuthor Commented:
The OS is the Standard version. "Any" is not a choice - only LAN, WAN, and *
* is any. You will need to create a lan side rule, since this is a temp firewall, any(*) from lan going to wan
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