This method is useful for addressing problems related to sending bulk emails via SMTP connectivity.
The listed commands are generally compatible with most mail servers. If these commands do not work for your server, you may need to make slight adjustments to the commands accordingly. Please contact your IT to check the settings in your Exchange server.
Note: that we are not Exchange specialists. These are some basic guidelines.
To test whether this configuration can be used to successfully route messages perform the following test:
Go to a DOS prompt.
Type telnet mail.YourDomain.com 25 (replace YourDomain.com with your domain name and replace the default port 25 if necessary), hit Enter.
This will determine whether the hostname is correct and whether the default SMTP port is open.
If you can connect, you should receive a message code [200], plus information about the mail server you've connected to.
Type the command ehlo YourDomain.com and ensure that it returns message code [250 OK]. This test will confirm whether the server is able to lookup a remote domain.
Type mail from:SMTPMAILBOXADDRESS (replace SMTPMAILBOXADDRESS with your Mailbox address specified in Entity console) and see that you get the Sender OK response.
Example:
mail from:[email protected]
250 2.1.0 [email protected].....Sender OK
Type rcpt to: RecipientEmailAddress and confirm that you get a response such as the following:
Example:
rcpt to:[email protected]
250 2.1.5 [email protected]
If you receive any messages like "421 4.3.2 service not available" or "5.7.1 Unable to relay", this means the server is not open for SMTP relay. System will be able to send messages to accounts on the same domain, but will not be able to sent externally.