If it isn't working with the SMTP plugins available, this usually means that there is a plugin conflict. By default, on my test environments, comma delimited e-mail addresses send to all e-mails listed without issue, so this feature does work. We just have to figure out what is special on your hosting platform that is stopping it from functioning.
Can I please have you try the following steps to see if there is a plugin/theme conflict that we can isolate?
Posted 7 years ago on Tuesday November 27, 2012 | Permalink