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A few days ago I updated exim to version 4.80 on my CentOS server and since then mails won't get sent anymore:

The mail server does not understand the MAIL FROM command. Reason: 220 domain.com ESMTP Exim 4.80 Fri, 20 Jul 2012 20:20:29 +0200

The mail server is not ready, it did not respond with a 220 status message.

The first message says something about the FROM command, and receiving a 220 message, the second complains about no 220 message even though it did come in.

Any ideas?

---

Quick and dirty fix that works:
smtp.php

	/**
	 * Fetch data from the SMTP server.
	 *
	 * @return string The data from the SMTP server
	 */
	function get_data($retries = 0)
	{
		$string = '';

		while((($line = fgets($this->connection, 515)) !== false))
		{
			$string .= $line;
			if(substr($line, 3, 1) == ' ')
			{
				break;
			}
		}
		if (strlen(trim($string)) == 0) {
			if ($retries == 3) {
				$this->fatal_error("Getting data failed after 4 attempts.");
				return false;
			}
			return $this->get_data($retries + 1);
		}
		$this->data = $string;
		$this->code = substr(trim($this->data), 0, 3);
		return $string;
	}