#38091 [Com]: when sending mail smtp helo does not use fqdn

ID: 38091 Comment by: rick at longbowgames dot com Reported By: danb1974 at gmail dot com Status: Assigned Bug Type: Mail related Operating System: windows xp pro PHP Version: 5.1.4 Assigned To: pajoye New Comment: This isn't really a bug in Windows, since the official documentation for Winsock[1] clearly states that the name returned by gethostname "can be a simple host name, or it can be a fully qualified domain name." Like many parts of Winsock, this is slightly different from the typical behaviour of the POSIX function of the same name, which usually returns a FQDN. Actually, while the name returned by gethostname() is *usually* a FQDN on a POSIX machine, I don't actually think it's guaranteed there, either. For a C solution, the code given by danb1974 should work. An easy way to do it in pure PHP is, instead of just calling gethostname(), call gethostbyaddr(gethostbyname(gethostname())). Thanks, -Rick- [1] http://msdn.microsoft.com/en-us/library/ms738527(VS.85).aspx Previous Comments: ------------------------------------------------------------------------ [2009-06-20 08:53:14] pajoye@php.net Reopen, seems to be still valid. ------------------------------------------------------------------------ [2006-07-14 07:45:01] danb1974 at gmail dot com It seems it's not enough to just gethostname. You have to do something like this (this is not actual production code): hostent *hent; gethostname(hname, sizeof(hname)); hent = gethostbyname(hname); strcpy(hostname, hent->h_name); // h_name is the official name according to winsock api ------------------------------------------------------------------------ [2006-07-14 06:45:35] ronabop@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php The windows XP "feature" for domain name resolution apparently gives out a bogus answer. This is an XP bug, not a PHP bug. Additionally, "trashcan2.intranet" is not a FQDN. See: <http://en.wikipedia.org/wiki/FQDN>. ------------------------------------------------------------------------ [2006-07-14 06:23:35] danb1974 at gmail dot com Ok now I'm confuzed. * smtp requires helo to send fqdn and not just the hostname (it's stated somewhere in the rfc's) * windows xp fqdn is what the computer reports as "full computer name" (at least so does some say, see http://www.ima.com/support/regprob.html) * a windows xp joined to a domain (a) does not give you any choice about the hostname, it's the computer name which is obviously not fqdn and (b) does report the correct name as "full computer name" * on linux it works correctly (not using hostname but hostname -f value which is the fqdn) So at this point it's basically "I cannot send mail from xp to an unforgiving mail server and yes it's a feature so I have to live with it" ------------------------------------------------------------------------ [2006-07-13 14:32:50] iliaa@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php The host name use is the same one as your machine will report if you run ipconfig /all (Host Name value). ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/38091 -- Edit this bug report at http://bugs.php.net/?id=38091&edit=1