We are running Omeka on an EC2 instance, and I can’t get Omeka to send any email of any kind. Anytime it tries, I get an exception: ‘Zend_Mail_Transport_Exception’ with message 'Unable to send mail. ’
I’ve verified that sendmail is installed and working (I’ve successfully sent mail from the command line), and also that the PHP mail() command works (by writing a small script that uses it to send an email). I’ve also checked the Omeka config file and it’s set to send mail via sendmail. Does anyone have any idea what might be wrong?