Starting March 30th, we noticed from time to time that emails sent from our webapp are failing:

Hello admins, there was an error on XXXXX.com at 2017-04-18 06:37:33. Here are the details: [SocketException] stream_socket_client(): SSL: Handshake timed out stream_socket_client(): Failed to enable crypto stream_socket_client(): unable to connect to ssl://smtp.zoho.com:465 (Unknown error)

The issues have started on March 30th and was followed on  Apr 8,  Apr 12,  Apr 14,  Apr 15,  Apr 18 and most recent on  Apr 28.

 Any ideas why thios happens onc ein a while? Are you able to see anything in your logs?