Get a Gravatar Image from an email address using PowerShell

Get-Gravatar.ps1

<#
.SYNOPSIS
    Retrieve an icon from Gravatar
.DESCRIPTION
    Retrieve an icon from Gravatar for the provided email address. 
.EXAMPLE
    PS C:\> Get-Gravatar -EmailAddress '[email protected]'
    Requests an image from Gravatar for the email address '[email protected]'
    If available, it will write a 300 pixel square image in the working dirctory
    with the name [email protected]
.EXAMPLE
    PS C:\> Get-Gravatar -EmailAddress '[email protected]' -Size 500 -Name 'Sally Sample'
    Requests an image from Gravatar for the email address '[email protected]'
    If available, it will write a 500 pixel square image in the working dirctory
    with the name 'Sally Sample.jpg'
.PARAMETER EmailAddress
    Required. An email address. Must be provided. Email address format not validated.
.PARAMETER Size
    Optional. An integer between 1 and 2048 defining the size of the image returned from Gravatar.
    Default value is 300 pixels. Images returned from Gravatar are square
.PARAMETER Name
    Optional. Name used for the output filename. Defaults to the email address.
.NOTES
    If there isn't an image in Gravatar, nothing is output.
#>
function Get-Gravatar {
    param (
        [Parameter(Mandatory=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$EmailAddress,
        [Parameter(Mandatory=$false)]
        [ValidateRange(1,2048)]
        [int]$Size = 300,
        [Parameter(Mandatory=$false)]
        [string]$Name = $EmailAddress
    )
    $emailAsBytes = [System.Text.Encoding]::UTF8.GetBytes($EmailAddress.Trim().ToLowerInvariant())
    $stringBuilder = [System.Text.StringBuilder]::new()
    $emailMd5Bytes = [System.Security.Cryptography.MD5]::Create()
    $emailHashBytes = $emailMd5Bytes.ComputeHash($emailAsBytes)
    for ($i = 0; $i -lt $emailHashBytes.Length; $i++) {
        $stringBuilder.Append( $emailHashBytes[$i].ToString('x2') ) | Out-Null
    }
    try {
        Invoke-WebRequest -Uri "https://www.gravatar.com/avatar/$($stringBuilder.ToString())?s=$Size&d=404" -OutFile $(Join-Path $pwd "$Name`.jpg")
    } catch {
        Write-Verbose "Error Occured $_"
    }
}