On 03/06/2003 06:08 AM, Vlad wrote:
When I use mail() function fom my php script (PHP4.3.1(as ISAPI) - IIS 5 - Win2K) some times, randomly, (not always!) I'm getting error: "SMTP error 550 5.7.1. Unable to relay to <destination_email_address>". I don't think that this is problem with my SMTP server - to prove this I'm sending emails with the same parameters from PERL script during the same time - works 100% fine. Did anyone have the same problem? Any ideas??
You problem seems to be due to the need to authenticate. See here for a recent response on the same problem:
http://news.php.net/article.php?group=php.windows&article=18867
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Regards, Manuel Lemos
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