First of all I wanna thank you for such a good Plugin! Using it for some time now and really like it!
Since of today I have a really strange issue though. I’m able to send emails (no error message) but the subscribers won’t receive them! So I checked and sending one with the “WordPress-only thing” works fine.
Already tried to change the sender, return path and reply to email addresses. Nothing works… The only thing I have in mind now is that my provider dumped PHP 5.2 and went to PHP 5.4! Could this be a problem?
Changes to PHP version SHOULD not interfere, since it is not a major release update. In the diagnostic panel, if you test the emails sent by Newsletter, none of them is delivered? Are you using the SMTP?
If I’m using no return or reply it doesn’t work with this address either. If I’m using just news@… it works. So there must be something wrong with the standard address