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Do you get any errors when you try to send an email?
If you see an error, please share the message.
Are the required ports and IP addresses allowed in security groups and network ACLs?
Thank you for sharing your message.
We want to make sure that we can communicate with the mail server, so try running the telnet command with the global IP address of the EC2 instead of the domain.
If you are able to communicate with the EC2 IP address, it is possible that the DNS settings are incorrect, so check that the MX record is registered correctly by using "nslookup" or similar. Check that EC2 is listening on port 465. If your EC2 is Linux, you can check the port number with the following command.lsof -i -P
For others who are reading along, there is an article about this: https://repost.aws/knowledge-center/ec2-windows-email-server-issues
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AWS公式更新しました 2ヶ月前
my message error "delayed, Status: 4.4.1 Cannot connect to remote host", i try to telnet port 465 or 587 from my windows on ec2, not connecting
Are the required ports and IP addresses allowed in security groups and network ACLs? Port 465,587 already allow in scurity group & network ACLs
Thank you for sharing your message.
We want to make sure that we can communicate with the mail server, so try running the telnet command with the global IP address of the EC2 instead of the domain.
If you are able to communicate with the EC2 IP address, it is possible that the DNS settings are incorrect, so check that the MX record is registered correctly by using "nslookup" or similar. Check that EC2 is listening on port 465. If your EC2 is Linux, you can check the port number with the following command.