clarkwinkelmann
Thanks, Logs shows like this
#42 {main}
[2019-05-02 06:03:10] production.ERROR: Swift_TransportException: Connection could not be established with host smtp.exmail.qq.com [ #0] in C:\IIS\answers\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\StreamBuffer.php:269
Does it mean the problem from the SMTP server? but this SMTP server working well in the mail application in my computer with the same setting.