SES Connectivity issue

Hi,

Have you taken a look at the following re:Post question? It seems very similar to your case.

If you are experiencing intermittent TCP connection timeout with a working public endpoint then it’s also something that we need to troubleshoot from the Lambda service itself. Because this may be due to packet fragmentation. Lambda functions cannot handle incoming fragmented TCP requests, since Lambda does not support IP fragmentation for TCP or ICMP.