IIS SMTP - The server response was: 5.7.1 Unable to relay for outgoing address, Still not working

Question

IIS-->Default SMTP Virtual Server-->Properties-->Access-->Relay restrictions just add or exclude >the IPs you care about, should resolve the issue.

but it still gives me the error as above. What am I doing wrong?

I'm using Windows Sever 2003 R2 and IIS6.

score 59 · Accepted Answer · edited Dec 21 '15 at 18:15

59

I was able to fix this in my case by:

Go to Administrative Tools -> IIS 6.0 Manager
Right click "SMTP Virtual Server" then Click Properties
Select Access tab
Click "Relay..." in Relay Restrictions
Select "Only the list below"
Add 127.0.0.1 and my server IP to the list
Check Allow all computers which successfully authenticate to relay, regardless of the list above
Click "OK"

edited Dec 21 '15 at 18:15

Community

answered Dec 13 '11 at 20:04

Mark Boltuc

My SMTP server was separate from the web server, so needed to define web server's IP instead. – Jussi Palo Sep 02 '16 at 13:50
For me it was the addition of 127.0.0.1 in the allow list. I had a local application using "localhost" port 25 for outbound emails. – Liam Dec 05 '16 at 15:11
Just a note to anybody else who doesn't read carefully (like me) - it is IIS 6.0 Manager, not the newer more commonly used IIS 7.x Manager. You won't find SMTP in the IIS7 tool. – NealWalters Oct 05 '20 at 17:22

1 Answers1