Send Email Node error (in a loop + Wait... Node)

Hello, when using the Send Email Node in a loop + a Wait… Node I get the following error from the Send Email Node from time to time - sometimes it is working, looping 2-4 times, but then the error pops up before finishing the loop:

Execute failed: The mail could not be sent due to the error “javax.mail.MessagingException: Exception reading response; nested exception is: java.net.SocketException: Connection reset”.

I already tried different settings for the Wait Node (5 -35 sec.) and different Connection Timeout & Read Timeout values, without success.

I hope you can help me!

Best Regards,

Christopher