Office365 - smtp authentication - failure

Question

Hello Everybody,

I have problems to post a question with screenshots here (Access denied). So maybe someone have an answer on this question:

https://techcommunity.microsoft.com/t5/office-365/failure-by-sending-an-email-with-smtp-authentication/m-p/1607588

Thanks in advance

Best regards
Marvin Peters

Answer 1

Are you in hybrid?

Have you tried to send an email from gmail or hotmail to your tenant?

Answer 2

Thanks for your answer.

Yes, we are hybrid.

The problem is, that we have a ticket-tool (third party) which has to send emails via basic authentication (smtp authentication).

Receiving mails isn´t the problem.

Answer 3

In addition to the suggestion provided by michev in your original thread, please also try using the command below to test the account again:

$EmailFrom = “myaccount@domain.com”  
$EmailTo = “emailaddress@domain.com”  
$Subject = “Test from O365 SMTP”  
$Body = “Test from O365 SMTP Authentication”  
$SMTPServer = “smtp.office365.com”  
$SMTPClient = New-Object Net.Mail.SmtpClient($SmtpServer, 587)  
$SMTPClient.EnableSsl = $true  
$SMTPClient.Credentials = New-Object System.Net.NetworkCredential(“myaccount@domain.com”, “*****”);  
$SMTPClient.Send($EmailFrom, $EmailTo, $Subject, $Body)  

please check the following requirements for SMTP client submission:

1. Authentication: You must be able to configure a user name and password to send email on the device.
2. Mailbox: You must have a licensed Office 365 mailbox to send email from.
3. Transport Layer Security (TLS): Your device must be able to use TLS version 1.0 and above.
4. Port: Port 587 or port 25 is required and must be unblocked on your network.

And the official document here about How to set up a multifunction device or application to send email using Microsoft 365 or Office 365

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