MailPoet on WordPress - cannot send mail
I have been having trouble sending mail through MailPoet, starting at the end of March. I can send test emails from their settings page, but when sending anything else, I get the 'could not instantiate mail function' with PHP and 'could not execute sendmail' when using sendmail. Original settings from early March don't work, and I have tried changing several settings without luck. The MailPoet site suggests contacting the host... has anything changed in the past month or so on the server side that might cause issues with sending mail from a Wordpress plugin? Any suggestions would be greatly appreciated!