Outgoing email of SharePoint server not working

Question

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

Answer 1

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 = "alias@company.com"
$subject = "Email through SharePoint OM"
$body = "Message body."

$site = New-Object Microsoft.SharePoint.SPSite "http://siteUrl"
$web = $site.OpenWeb()
[Microsoft.SharePoint.Utilities.SPUtility]::SendEmail($web,0,0,$email,$subject,$body)

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.

Answer 2

Had to add my local IP to the SMTP server allow list, not just 127.0.0.1 http://sharepointbulletin.blogspot.com/2014/03/mailbox-unavailable-server-response-was.html