After Change our SMTP server change to Office 365,server not sent any mail(outgoing mail)

I have already Configure outgoing email for a farm and Configure outgoing email for a specific web application

for new SMTP server name as per Reference

Is any way to debug SMTP service or else any configuration any more,In that

  • Is there any set-up while install SMTP service? Commented Jan 2, 2016 at 7:05

2 Answers 2


For debug purposes, you can do a few things.

First is to use the Send-MailMessage cmdlet. This is an alternative to using telnet to test SMTP functionality. If neither of these work, I would take a look at the SMTP server logs. Those logs may show that the SMTP server is dropping the mail due to access permissions (perhaps scoped IP range on a receive connector) or dropping mail if it requires authentication (SharePoint 2010/2013 can only send anonymous mail over tcp/25). You could also look at the SharePoint server, perhaps it has host-based A/V that blocks outgoing tcp/25. Make sure that nlsookup and tracert show the correct information from the SharePoint server to your SMTP server hostname. And of course, there could be a firewall issue, inbound on the SMTP server or outbound on the SharePoint server.

If Send-MailMessage does work, you can try sending email from SharePoint using PowerShell:

$email = "[email protected]"
$subject = "Email through SharePoint OM"
$body = "Message body."

$site = New-Object Microsoft.SharePoint.SPSite "http://siteUrl"
$web = $site.OpenWeb()

While you're running this, use ulsviewer to monitor the ULS logs on the SharePoint server and filter to the "E-Mail" category. This should give you information on not only what SharePoint is attempting to connect to, but any potential errors it is encountering.

  • it gives false in Management shell Screen ,Or not any specific "email" related log @trevor Commented Mar 31, 2016 at 10:52
  • The ULS logs filtered by catagory:email had the real logs, thanks!
    – Aaron
    Commented Nov 17, 2016 at 15:24

Had to add my local IP to the SMTP server allow list, not just http://sharepointbulletin.blogspot.com/2014/03/mailbox-unavailable-server-response-was.html

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.