"Send-MailMessage : The remote name could not be resolved:" Error shows while using Send-MailMessage cmdlet ?

Question

"Send-MailMessage : The remote name could not be resolved:" Error shows while using Send-MailMessage cmdlet ?

Svb 71

Hi !
Send-MailMessage -SmtpServer "abc.contoso.com" -From "******@abc.contoso.com" -To "******@abc.contoso.com" -Subject "Test" -Body "Good Morning"

When I use the above code it show error
"Send-MailMessage : The remote name could not be resolved: abc.consto.com"

Can anyone tell why its not working and show that error?

Thank you!

Accepted answer

1 additional answer

Your answer

Answer 1

Kael Yao 37,746 Moderator

Hi @Svb

As mentioned above, please also make sure you have checked these settings in your tenant: Error: Authentication unsuccessful

The issue may be caused by Azure Security Defaults is enabled (by default) in your tenant, and you need to disable it in Azure AD protocol.

There is also a link with the same issue for your reference: 535 5.7.139 Authentication unsuccessful

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Svb 71 Reputation points

2022-03-09T05:25:47.21+00:00

@Kael Yao I have made all changes you mentioned, now it's taking long time to execute the cmdlet and showing error
"Send-MailMessage : The operation has timed out."

and also some time its shows error
"Send-MailMessage : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 Client not authenticated to send mail.
[PN2PR01CA0064.INDPRD01.PROD.OUTLOOK.COM]"
Kael Yao 37,746 Reputation points Moderator

2022-03-09T06:00:25.983+00:00
Have you added -credential (get-credential) to pass credentials of the sender to the Office 365 server?

Example:

Send-MailMessage -From 'sender <******@domain.com>' -To 'recipient <******@domain.com>' -Subject 'relay' -Body "test" -SmtpServer smtp.office365.com -port 587 -useSSL -credential (get-credential)
Svb 71 Reputation points

2022-03-09T06:41:36.627+00:00
Thanks a lot for your help! @Kael Yao and @Ashok M

I also have some doubts can you please help me out,

How to use SMTP client server instead of Office 365 SMTP?

Is there any other way to send mail without disabling security defaults?

What is the use of parameter useSSL ?
Kael Yao 37,746 Reputation points Moderator

2022-03-09T07:35:45.83+00:00

Glad to help.

1.How to use SMTP client server instead of Office 365 SMTP?

If the sender mailbox is hosted by Office 365 (Exchange Online), actually you are using Office 365 servers for SMTP relay.
If you switch to other mail service, the SMTP server here would be their SMTP servers.

2.Is there any other way to send mail without disabling security defaults?

I am afraid not.
As the security defaults would block Basic Auth for SMTP.

3.What is the use of parameter useSSL ?

Please refer to this link: Send-MailMessage

If you don't add the parameter, you would receive the following error:

Answer 2

Ashok M 6,846

Hi,

If this is for on-premise Exchange, please check if the DNS record is available and resolvable for smtp name ABC.contoso.com. Alternatively, you can also try server fqdn, servername.domain.com

In this command, it looks like your email address is ABC.contain.com and you are using the same in SMTP server which will resolve to the Domain controller in case your domain is ABC.contoso.com. So try creating a new record like smtp.abc.contoso.com resolving to Exchange and use it in send-mailmessage

Also check for firewall ports 25/587 is allowed.

If the above suggestion helps, please click on “Accept Answer” and upvote it.

Svb 71 Reputation points

2022-03-08T10:55:58.453+00:00

I have made the changes you mentioned, but this time its showing another error ie:-
"Send-MailMessage : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 Client not authenticated to send mail. Error: 535 5.7.139
Authentication unsuccessful, SmtpClientAuthentication is disabled for the Tenant. Visit https://aka.ms/smtp_auth_disabled for more information. [PN1PR0101CA0048.INDPRD01.PROD.OUTLOOK.COM]"

Can you please help me to solve this.
Ashok M 6,846 Reputation points

2022-03-08T11:17:45.153+00:00

Thanks for the update. This error is because the SMTP auth is not enabled on the exchange online tenant.
Try enabling the SMTP auth for the mailbox using the below steps and try again.

https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission
Svb 71 Reputation points

2022-03-08T13:15:44.927+00:00

@Ashok M Again it's shows error after enabling the SMTP auth
"Send-MailMessage : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 Client not authenticated to send mail.
Error: 535 5.7.139 Authentication unsuccessful, the request did not meet the criteria to be authenticated successfully. Contact your administrator."
Rich Matheisen 47,901 Reputation points

2022-03-08T15:31:01.087+00:00

You'll find a number of posts reporting this problem. Just search the web for "535 5.7.139 Authentication unsuccessful, the request did not meet the criteria to be authenticated successfully" and you'll get a way to correct the problem -- just be aware that there are several reasons for the error, but all of them are under your control.

Share via

"Send-MailMessage : The remote name could not be resolved:" Error shows while using Send-MailMessage cmdlet ?

1 additional answer

Your answer