First of all, I use self-hosted plan, and has upgraded the forum to v4.4.5.
In my ACP, I got a 'Emails Failing to Send' message, which give the following error info:
First I checked the 'failedMailCount.1607bf77de.php' file on my server, I got no such file or directory info. Then I used support feature to clear the cache, the notification is still here. So I tried to click the resend button, I got 'A configuration or server error has occurred' error which also show the 'filesize(): stat failed for ..' just like the notification error.
After this, I entered the 'Email Settings' page, the outgoing and incoming email address is OK, the mail delivery method just use the default option 'PHP'. I tried the 'test settings' function, also no lucky, 'IPS\Email\Outgoing\Exception: email_test_mailfunction_disabled (0)' displayed on the top.
I have searched the forum, but did not helpful info to resolve this issue, so I create this topic.
Any suggestion will me great appreciated.