ServerBuddies Support Blog

Checking your outgoing mail server (Is Port 25 blocked?)

Many email clients and services use port 25 for SMTP to send out emails. However an ISP (Internet Service Provider) may block port 25 in order to prevent spamming by its customers. Here is how you can check to see if port 25 is blocked on your network.

1. Type the following command:

2. View Results:
If port 25 is not blocked you will get a successful 220 response (text may vary).

If port 25 is blocked you will get a connection error or no response at all.

Tags: Checking, mail, outgoing, server

hotmail and yahoo mail spam flagging issue

If you have more than one domain on your server it is better to use our SPF Record to fix this issue.

For example:

Server is sending mail as mail.serverbuddies.com but when the receiving mail server performs a reverse PTR lookup, it finds serverbuddies.com MISMATCH The solution would then be to tell qmail that it is sending mail as domain.com instead of mail.serverbuddies.com.

Here is the fix.

Tags: flagging, hotmail, issue, mail, Spam, yahoo

Remove MailMan from Plesk

Login to your Dedicated-Virtual Server using SSH as the root user. Now lets run the command to find what version of mailman is currently installed.

You should find results similar to the following

Now we will use rpm to uninstall

Tags: Mailman, plesk, remove

Enable Mailman in Plesk

The following steps will show you how to enable Mailman.

1. Login to Plesk.
2. Click on Server.
3. Click on Set Up Mailman.
4. Configure Mailman by providing the Mailing list administrator’s email and password.
5. Once you hit OK you should be taken back to the server page with the message letting you know that the Mailman icon will no longer be accessible.

For information on using Mailman please visit http://www.gnu.org/software/mailman/index.html

Tags: enable, Mailman, plesk

How do I apply package updates from the Red Hat Network?

Systems must be registered before updates from RHN can be applied. This can be done by using the “Software Updater” application from the “System Tools” menu, or via the command line by using the “rhn_register” command.

To access updates from RHN when using Red Hat Enterprise Linux 5, launch the graphical update tool through Applications -> System Tools -> Software Updater, or from the command line via the following command:

For a command line interface, use the following command to update the operating system:

To install a specific package, such as elinks, use the following command:

To update a specific package, such as httpd, use the following command:

Tags: apply, Hat, Network, package, Red, updates