SMTPClient Failure During Send Concerning Arguments

Question

I am trying to setup an email PowerShell script that will let me send an email when the task scheduler runs the script. The problem i am getting is:

Exception calling "Send" with "1" argument(s): "The remote certificate is invalid according to the validation procedure."

I am running the following code:

$SMTPClient = New-Object Net.Mail.SmtpClient("SMTP", PORT)
$SMTPClient.Credentials = New-Object System.Net.NetworkCredential("username", "password")
$MailMessage = (New-Object system.net.mail.mailmessage)
$MailMessage.from = ("FROM")
$MailMessage.To.Add("TO")
$MailMessage.Subject = ("Subject")
$MailMessage.Body = ("Body")
$Smtpclient.EnableSsl = ($true)
$SmtpClient.Timeout = (300000)
$SmtpClient.Send($MailMessage)
Write-Output "Message sent";

It gives me the error as specified above. Why?

Try to remove the 'EnableSsl', also you can use `Send-MailMessage` cmdlet — Avshalom, Apr 03 '16 at 12:37
I have to use SSL fro this particualar SMTP client. It does not work without. I think i have already tried the send-mailmessage cmdlet and the problem is that i did not know how to get all the parameters specified in that command, while smtpclient.send adds all of them in. Any other ideas? — Josh, Apr 03 '16 at 13:25
[A quick and easy solution](https://social.technet.microsoft.com/Forums/en-US/d9e9af2b-3bb9-4cb4-8046-dd0a092bc456/send-email-by-powershell?forum=winserverpowershell). — Alexander Obersht, Apr 03 '16 at 14:57
[Additional info and alternative solutions](http://stackoverflow.com/questions/777607/the-remote-certificate-is-invalid-according-to-the-validation-procedure-using) (in C#). — Alexander Obersht, Apr 03 '16 at 15:04

score 13 · Answer 1 · edited May 06 '22 at 13:18

13

To resolve the issue, just before the send command:

[System.Net.ServicePointManager]::ServerCertificateValidationCallback = { return $true }

edited May 06 '22 at 13:18

ΩmegaMan

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answered Apr 03 '16 at 19:17

Josh

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Worked like a charm! Thanks – Deepak Rao Jul 15 '20 at 04:55

score 4 · Answer 2 · answered Feb 03 '17 at 16:17

This still doesn't resolve the fact the you have an issue with your certificate, perhaps a mismatch with host, expired certificate or intermediate certificate. By adding this class above to your script before the call to Send you are disabling certificate validation, this is a workaround only if you do not need to address the certificate issue.

score 2 · Answer 3 · answered Aug 27 '19 at 04:14

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$Smtpclient.EnableSsl = ($false)

it solved my problem :)

answered Aug 27 '19 at 04:14

Aimee_King

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Worth noting this just disables secure (TLS) connections. Which is fine if that's what you want, but it doesn't solve the problem and is insecure. – DiscoveryOV Jun 19 '23 at 15:54

SMTPClient Failure During Send Concerning Arguments

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