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FEATURE: M365_BUILDER add support for alternative MX hosts #3191

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FEATURE: M365_BUILDER add support for alternative MX hosts #3191

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dfeef23
Add mxHost label to M365_BUILDER
ajh0912 Nov 4, 2024
91a7208
Add to mxHost to M365_BUILDER docs
ajh0912 Nov 4, 2024
45d12b6
Change existing example name in M365_BUILDER docs
ajh0912 Nov 4, 2024
4814564
Add new example for all services and DNSSEC MX in M365_BUILDER
ajh0912 Nov 4, 2024
3d6bf11
Format helpers.js
ajh0912 Nov 4, 2024
7b46549
Update types after go generate
ajh0912 Nov 4, 2024
4b2c832
Update parameter_types frontmatter for M365_BUILDER
ajh0912 Nov 4, 2024
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24 changes: 23 additions & 1 deletion commands/types/dnscontrol.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1863,7 +1863,7 @@ declare function LOC_BUILDER_STR(opts: { label?: string; str: string; alt?: numb
*
* This sets up `MX` records, Autodiscover, and DKIM.
*
* ### Advanced example
* ### Example with MDM only
*
* ```javascript
* D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
Expand All @@ -1881,10 +1881,32 @@ declare function LOC_BUILDER_STR(opts: { label?: string; str: string; alt?: numb
*
* This sets up Mobile Device Management only.
*
* ### Example with all services and DNSSEC MX
*
* ```javascript
* D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
* M365_BUILDER("example.com", {
* mx: true, // Can be omitted as default: true
* mxHost: "o-v1.mx.microsoft", // Override the default mail.protection.outlook.com
* autodiscover: true, // Can be omitted as default: true
* dkim: true, // Can be omitted as default: true
* skypeForBusiness: true,
* mdm: true,
* initialDomain: "example.onmicrosoft.com",
* }),
* END);
* ```
*
* This sets up MX (custom), AutoDiscover, DKIM, Skype for Business/Microsoft Teams and Mobile Device Management records.
*
* Instead of the default MX target ending in `mail.protection.outlook.com`, this example uses `<random-id>.mx.microsoft` which is a DNSSEC signed zone.
* `<random-id>` is obtained from Microsoft after [enabling DNSSEC functionality for the domain](https://learn.microsoft.com/purview/how-smtp-dane-works#inbound-smtp-dane-with-dnssec) within Exchange Online.
*
* ### Parameters
*
* * `label` The label of the Microsoft 365 domain, useful if it is a subdomain (default: `"@"`)
* * `mx` Set an `MX` record? (default: `true`)
* * `mxHost` Set your MX host for Exchange Online (default: `mail.protection.outlook.com`)
* * `autodiscover` Set Autodiscover `CNAME` record? (default: `true`)
* * `dkim` Set DKIM `CNAME` records? (default: `true`)
* * `skypeForBusiness` Set Skype for Business/Microsoft Teams records? (default: `false`)
Expand Down
27 changes: 26 additions & 1 deletion documentation/language-reference/domain-modifiers/M365_BUILDER.md
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Expand Up @@ -13,6 +13,7 @@ parameters_object: true
parameter_types:
label: string?
mx: boolean?
mxHost: string?
autodiscover: boolean?
dkim: boolean?
skypeForBusiness: boolean?
Expand Down Expand Up @@ -42,7 +43,7 @@ END);

This sets up `MX` records, Autodiscover, and DKIM.

### Advanced example
### Example with MDM only

{% code title="dnsconfig.js" %}
```javascript
Expand All @@ -62,10 +63,34 @@ END);

This sets up Mobile Device Management only.

### Example with all services and DNSSEC MX

{% code title="dnsconfig.js" %}
```javascript
D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
M365_BUILDER("example.com", {
mx: true, // Can be omitted as default: true
mxHost: "o-v1.mx.microsoft", // Override the default mail.protection.outlook.com
autodiscover: true, // Can be omitted as default: true
dkim: true, // Can be omitted as default: true
skypeForBusiness: true,
mdm: true,
initialDomain: "example.onmicrosoft.com",
}),
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The trailing comma should be removed, I think.

END);
```
{% endcode %}

This sets up MX (custom), AutoDiscover, DKIM, Skype for Business/Microsoft Teams and Mobile Device Management records.

Instead of the default MX target ending in `mail.protection.outlook.com`, this example uses `<random-id>.mx.microsoft` which is a DNSSEC signed zone.
`<random-id>` is obtained from Microsoft after [enabling DNSSEC functionality for the domain](https://learn.microsoft.com/purview/how-smtp-dane-works#inbound-smtp-dane-with-dnssec) within Exchange Online.

### Parameters

* `label` The label of the Microsoft 365 domain, useful if it is a subdomain (default: `"@"`)
* `mx` Set an `MX` record? (default: `true`)
* `mxHost` Set your MX host for Exchange Online (default: `mail.protection.outlook.com`)
* `autodiscover` Set Autodiscover `CNAME` record? (default: `true`)
* `dkim` Set DKIM `CNAME` records? (default: `true`)
* `skypeForBusiness` Set Skype for Business/Microsoft Teams records? (default: `false`)
Expand Down
13 changes: 6 additions & 7 deletions pkg/js/helpers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1879,15 +1879,14 @@ function M365_BUILDER(name, value) {

var r = [];

// MX host (default: "mail.protection.outlook.com")
if (!value.mxHost) {
value.mx = 'mail.protection.outlook.com';
}

// MX (default: true)
if (value.mx) {
r.push(
MX(
value.label,
0,
value.domainGUID + '.mail.protection.outlook.com.'
)
);
r.push(MX(value.label, 0, value.domainGUID + '.' + value.mxHost + '.'));
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The PowerShell(?) commands (link to highlight, might not work in all browsers) returns the whole MX hostname: contosotest-com.o-v1.mx.microsoft.

Therefore, and to make the helper more flexible in general, I advise to do one of the following:

  1. Document how to disable the MX and set the Microsoft-provided hostname. (preferred)
  2. Allow any MX to be set, possibly multiple MXs

Documentation for the first option could look like this:

D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
  M365_BUILDER("example.com", {
      mx: false,
      …
  }),
  MX('@', 0, 'example-com.<random>.mx.microsoft.') // Note the trailing dot.
);

}

// Autodiscover (default: true)
Expand Down