My Sharepoint Server is configured to use a local SMTP Server (the server's own IIS 6.0 SMTP virtual server). The problem with this is that the message headers of these emails don't receive the reverse DNS information, but I actually have a real mail server running (hMailServer) and I'd rather use that for smtp, or maybe even gmail.

How can I configure my Portal's outgoing email to use an external smtp server? I could set a different Outbound SMTP Server in SCA's Outgoing Email Settings, but there is nowhere to specify the login password for that server.

Or is there a way to make the local SMTP Virtual Server (in IIS6) to use my real mail server for SMTP?

  • 1
    This post describes setting up relay to external SMTP server from the default SMTP server on SP server, but I am not sure if this will provide the reverse DNS info u are looking for: blogs.technet.com/b/yashgoel-msft/archive/2012/10/26/…
    – Prakash
    Nov 30, 2015 at 21:27
  • Thanks! Actually, I was just looking at that page... And I found I already had it configured, but had not set the FQDN correctly, nor added a masquerade domain...
    – bgmCoder
    Nov 30, 2015 at 21:38

1 Answer 1


This post describes setting up relay to external SMTP server from the default SMTP server (on SharePoint server). Authentication information can be provided while setting up the outbound security:



  • I found it was necessary to set the FQDN in both IIS6 settings AND in SCA's Outgoing Email Settings. This prevents email servers like google from seeing a mismatch in the domain/sender email headers.
    – bgmCoder
    Nov 30, 2015 at 22:00

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