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PHP mail "unable to relay" error

Posted on 2010-09-20
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Last Modified: 2012-05-10
Hi there. I'm building email functionality on a PHP contact form processor. It sends to and from a set email address on the same domain as the server. I have tested this successfully on my own development server, but when the code is tested on the client's web site, I get the following error message:

"Warning: mail() [function.mail]: SMTP server response: 550 5.7.1 Unable to relay for username@domain.com in C:\Program Files (x86)\EasyPHP-5.3.3\www\contact\feedback.php on line 221"

Note: i removed the email address and put 'username@domain.com' in its place. Online, I'm using a valid email address.

I don't have access to the client's web server. He deploys the code himself. Are there any instructions I could briefly point my client to in order for him to properly configure his mail server?

Thanks!
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Question by:thtate
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Accepted Solution

by:
rstjean earned 250 total points
ID: 33721164
the odds are that the client's mail server doesn't allow the website to relay email.  You can get the ISP to put in a rule to relay, or if the hosting machine is a windows server then you will need to configure IIS as follows.

1) Go to: start > settings > control panel > Administrative Tools > Internet Information Services
2) Expand the " (local computer)" node
3) Right click on your SMTP server > go to "Properties"
4) Click "Access" tab
5) Under Relay Restrictions, click the "Relay" button
6) Click "Add"
7) Select "Single Computer" and enter IP address 127.0.0.1
8) Hit OK, OK, OK (until the properties dialog is closed)
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Assisted Solution

by:Dave Baldwin
Dave Baldwin earned 250 total points
ID: 33721199
Can he send email on that server with the email address you're using?  Did you try adding the "-f" fourth parameter in the mail() statement?  That's a Windows error statement.  What SMTP server did he install?
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Author Comment

by:thtate
ID: 33725001
Turns out that the client needed to change some settings in his PHP.INI file.

Now the relay error is no more.

Thank you both for the help!
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Author Closing Comment

by:thtate
ID: 33859806
Thanks!
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