Joomla: Sending mail takes ages

I have a Joomla website up and running and need to set up a simple contact form.

The problem is, whenever Joomla tries to send an email, the page will hang for about a minute before I get a response. The mail will ultimately be sent 开发者_如何转开发fine, but the delay is way too big. I've tried setting the outgoing mail setting to PHP Mail, Sendmail and an SMTP server, all with the same effect.

Curiously, if I edit components/com_contact/controllers/contact.php and replace the lines that send the mail with a simple call to mail(), everything works fine.

Using Joomla 1.6.5, CentOS5 with PHP 5.3.

Anyone experienced something similar? Thanks in advance!

(Also, is this a case for StackOverflow or ServerFault? It seems borderline!)

Updated: Narrowed this down to PHPMailer using uniqid to generate its boundary strings. It seems that on some platforms, uniqid (without the more_entropy flag) is extremely slow.

If anyone else ever comes across the same problem, edit libraries/phpmailer/phpmailer.php and in the first few lines of the CreateHeader() function, pass true as the second argument of uniqid(). Seems to have fixed it.

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Narrowed this down to PHPMailer using uniqid to generate its boundary strings. It seems that on some platforms, uniqid (without the more_entropy flag) is extremely slow.

If anyone else ever comes across the same problem, edit libraries/phpmailer/phpmailer.php and in the first few lines of the CreateHeader() function, pass true as the second argument of uniqid(). Seems to have fixed it.