This error occurs when the client (such as an EC2) cannot establish a TCP connection to the public endpoint of Amazon SES. Generally, this is caused when the client (EC2) has a firewall to block outgoing connections on the SMTP ports (25, 587, or 465) or if the client does not have access to an internet connection.
To resolve the error, ensure that the client has an active/stable internet connection.
Hereafter, update the firewall rules on the client to allow outgoing connections on ports 25, 587, and 465 (depending on the port you use).
View all errors