Add Caution info about duplicate SMTP addresses

[cabailey]

No description provided.

[learn-build-service-prod]

Learn Build status updates of commit 18501ed:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-AppRetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)
exchange/exchange-ps/exchange/Set-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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[learn-build-service-prod]

Learn Build status updates of commit a956b9a:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-AppRetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)
exchange/exchange-ps/exchange/Set-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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[learn-build-service-prod]

Learn Build status updates of commit 37d7c2b:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-AppRetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)
exchange/exchange-ps/exchange/Set-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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[cabailey]

@chrisda I didn't think PowerShell reference supported formatting for callouts and bold - or is that just for local help & EXO has none?

[chrisda]

@cabailey, the cmdlet reference content serves two different opposing goals: help on the web and help at the command line. Most markdown formatting (with the exception of more than one level in bulleted/numbered lists) is supported but is lost for help at the command line. I try to strike a balance. Instead of using Alert text (with the exception of the SYNOPSIS or DESCRIPTION sections), I just use bold.

[learn-build-service-prod]

Learn Build status updates of commit 559722f:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-AppRetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)
exchange/exchange-ps/exchange/Set-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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[learn-build-service-prod]

Learn Build status updates of commit c7d2448:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-AppRetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)
exchange/exchange-ps/exchange/Set-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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[learn-build-service-prod]

Learn Build status updates of commit 2675d53:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/exchange-ps/exchange/Set-AppRetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)
exchange/exchange-ps/exchange/Set-RetentionCompliancePolicy.md	✅Succeeded	View (exchange-ps)

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[cabailey]

#sign-off & merging