![]() 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. If traffic is blocked at the SMTP port, then make sure that the following configurations are correct:.To verify that traffic is blocked, use Test-NetConnection or the telnet utility to check for connectivity at the SMTP port.Resolution Your security groups or network ACLs block SMTP traffic on ports 25, 587, or 465 You can't send emails even though you can receive them.Emails aren't delivered to a specific domain.Your outbound messages are flagged as spam.The instance's public IP address changes after you stop and start the instance.For more information, see How do I remove the restriction on port 25 from my Amazon EC2 instance or AWS Lambda function? To send outbound traffic on port 25, request the removal of this restriction. Note: By default, outbound traffic is blocked on port 25 (SMTP) for all Amazon EC2 instances and AWS Lambda functions. Your security groups or network access control lists (network ACL) block SMTP traffic on ports 25, 587, or 465.Selecting a region changes the language and/or content on you use SMTP to send email from your instance, you might encounter several common problems: Note: To have ColdFusion try to resend a message that it could not deliver, move the message file from the Undelivr directory to the Spool directory.įor more information about the mail logging settings in the ColdFusion Administrator, see Configuring and Administering ColdFusion. The error log entry that corresponds to the undelivered message contains the name of the file written to the UnDelivr (or undelivr) directory. On UNIX: /opt/ coldfusion/mail/undelivr.If a message is not delivered because of an error, ColdFusion writes it to this directory: The log entries contain the date and time of the error as well as diagnostic information about why the error occurred. For more information, see Configuring and Administering ColdFusion.ĬoldFusion logs all errors that occur during SMTP message processing to the file mail.log in the ColdFusion log directory. ![]() ![]() Some ColdFusion editions have advanced spooling options that let you fine-tune how ColdFusion sends mail. If ColdFusion is busy or has a large existing queue of messages, however, delivery can occur after the spool interval. You can set how frequently ColdFusion checks for spooled mail messages on the Mail page in the ColdFusion Administrator.
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