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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
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.
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
