Email 如何在Powershell中对邮件主题进行编码？

我正在尝试使用Powershell发送邮件，邮件主题和正文上带有日语字符。邮件发送成功，正文中的日文字符很好。但它在这个主题中并不起作用。我得到了

=？iso-2022-jp？Q？=1B=24B=25F=259=25H=1B=28B？=

而不是

テスト

有人能帮我吗

代码：

$eSubject = "テスト This is subject"
$eBody = "テスト テスト テスト This is body"

$Encode = [Text.Encoding]::GetEncoding("csISO2022JP");
$s64 = [Convert]::ToBase64String($Encode.GetBytes($eSubject), [Base64FormattingOptions]::None)

$Mail = New-Object Net.Mail.MailMessage("From@mail.com","To@mail.com")
$Mail.Subject = [String]::Format("=?{0}?B?{1}?=", $Encode.HeaderName, $s64)

$View = [Net.Mail.AlternateView]::CreateAlternateViewFromString($eBody, $Encode, [Net.Mime.MediaTypeNames]::Text.Plain)
$View.TransferEncoding = [Net.Mime.TransferEncoding]::SevenBit
$Mail.AlternateViews.Add($View)

$SmtpClient = NEW-OBJECT Net.Mail.SmtpClient("localhost","25")
$SmtpClient.Send($Mail)

$eSubject = "テスト This is subject"
$eBody = "テスト テスト テスト This is body"

$Encode = [Text.Encoding]::GetEncoding("csISO2022JP");

$Mail = New-Object Net.Mail.MailMessage("From@mail.com","To@mail.com")
$Mail.Subject = $eSubject

$View = [Net.Mail.AlternateView]::CreateAlternateViewFromString($eBody, $Encode, [Net.Mime.MediaTypeNames]::Text.Plain)
$View.TransferEncoding = [Net.Mime.TransferEncoding]::SevenBit
$Mail.AlternateViews.Add($View)

$SmtpClient = NEW-OBJECT Net.Mail.SmtpClient("localhost","25")
$SmtpClient.Send($Mail)

使用默认CmdLet
Send-MailMessage
时，对我来说效果很好：

$EmailParams = @{
    To          = 'Destination@domain.com'
    From        = 'From@domain.com'
    Subject     = 'テスト This is the subject'
    Body        = 'テスト This is the body'
    SMTPServer  = 'YourSMTPServer'
    Encoding    = 'UTF8'
}
Send-MailMessage @EmailParams

我不知道怎么做。但它现在起作用了，我只是删除了主题的编码

代码：

$eSubject = "テスト This is subject"
$eBody = "テスト テスト テスト This is body"

$Encode = [Text.Encoding]::GetEncoding("csISO2022JP");
$s64 = [Convert]::ToBase64String($Encode.GetBytes($eSubject), [Base64FormattingOptions]::None)

$Mail = New-Object Net.Mail.MailMessage("From@mail.com","To@mail.com")
$Mail.Subject = [String]::Format("=?{0}?B?{1}?=", $Encode.HeaderName, $s64)

$View = [Net.Mail.AlternateView]::CreateAlternateViewFromString($eBody, $Encode, [Net.Mime.MediaTypeNames]::Text.Plain)
$View.TransferEncoding = [Net.Mime.TransferEncoding]::SevenBit
$Mail.AlternateViews.Add($View)

$SmtpClient = NEW-OBJECT Net.Mail.SmtpClient("localhost","25")
$SmtpClient.Send($Mail)

$eSubject = "テスト This is subject"
$eBody = "テスト テスト テスト This is body"

$Encode = [Text.Encoding]::GetEncoding("csISO2022JP");

$Mail = New-Object Net.Mail.MailMessage("From@mail.com","To@mail.com")
$Mail.Subject = $eSubject

$View = [Net.Mail.AlternateView]::CreateAlternateViewFromString($eBody, $Encode, [Net.Mime.MediaTypeNames]::Text.Plain)
$View.TransferEncoding = [Net.Mime.TransferEncoding]::SevenBit
$Mail.AlternateViews.Add($View)

$SmtpClient = NEW-OBJECT Net.Mail.SmtpClient("localhost","25")
$SmtpClient.Send($Mail)