ColdFusion's native integration with Amazon Web Services allows you to quickly leverage the power of AWS services either on-premise or on the cloud. The 2021 release of Adobe ColdFusion on Amazon Web Services is a high performing application server that lets enterprises develop, design, and deploy web and cloud-native applications to gain a competitive advantage and drive business growth. This issue occurs when you don't configure the authentication that the outgoing (SMTP) server requires.Adobe ColdFusion (2021 Release) Windows with FusionReactor You can't send emails even though you can receive them ![]() Use an email header analyzer tool to analyze the message header for diagnostic information.The standard email size setting is 22 MB. Even if you don't have a size restriction on sent mail, the recipient might have limits on incoming mail size. If the problem is at the destination, make sure that your emails aren't too large for the destination to accept. If emails are stacking in the queue on your server, make sure that there aren't performance issues on your SMTP server. Check whether the email queue is slow on your server, or if emails leave your server on time but are slow to arrive at the destination.Check your email server configuration to make sure that nothing has changed.Check whether the delayed emails are going to one specific address or domain.If your emails are delayed, then follow these steps: Make sure that your emails aren't too large for the destination to accept.Check whether the recipient domain is blocking your IP address.If you can't send emails to a specific domain, then follow these steps: How do I troubleshoot issues with the PTR record that I'm using for reverse DNS in Route 53? Emails aren't delivered to a specific domain How do I activate reverse DNS functionality for Amazon Route 53 with a PTR record? For more information on reverse DNS records, see the following resources:Ĭonfigurable reverse DNS for Amazon EC2's Elastic IP addresses It's a best practice to set up these records to prevent outbound emails from being flagged as spam. If you're missing DKIM authentication, SPF records, or a reverse DNS record set, then your outbound messages might be flagged as spam. Your outbound messages are flagged as spam ![]() To avoid this, make sure that the mail server instance has an Elastic IP address assigned to it. However, this address changes whenever you stop and start the instance. Your instance is automatically assigned a public IP address. The instance's public IP address changes after you stop and start the instance The EC2 instance must have internet connectivity. The firewall and antivirus application on your Windows instance must allow traffic to the SMTP server on TCP port 25, 587, or 465. The network ACL inbound (ingress) rules must allow traffic from the SMTP server on TCP ports 1024-65535. The network ACL outbound (egress) rules must allow traffic to the SMTP server on TCP port 25, 587, or 465. The security group outbound (egress) rules must allow traffic to the SMTP server on TCP port 25, 587, or 465.
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