Checklist of recommended best practices for your office email server
Feb 02, 2011
Having a latest hardware with leased internet connectivity and a feature rich email client are not the only requirements you need to setup your office email server. Unless you can send mails to your clients, partners and associates across the globe, your mail server is of no practical use. It is the trustworthiness of your mail server over the Internet that is standing between you and the recipient.
To be a trusted E-mail sender we need to follow the best practices
which are highlighted below:
1. Messages from IP (No Domain)
Messages should be from a domain and not from any IP Address. e.g. user@null
domain.com is a valid sender, whereas user@null
192.168.0.18 is an invalid sender and thus the mail will be rejected.
2. Mail Servers on Dynamic/Dial-up Addresses
The sender server IP Address must not be a dynamic IP. Normally all IP addresses should have a correct reverse DNS, and especially email servers. Most Anti-Spam tools will reject email from places whose reverse DNS looks not to belong to an email server, but more likely to be a home or office dynamic address. If you are running an email server, make sure the Reverse DNS of the IP address reflects your domain, e.g. ‘gateway.yourdomain.com’ or ‘mail.yourdomain.com’.
3. Valid FROM domain
The FROM address is important as it is the address that would be used if problems were encountered delivering the message, so if the address can’t be responded to, the E-mail cannot be accepted from that address either.
yourdomain.com is an accepted sender but the following bad examples will get rejected:
4. The sender server must identify itself and the identification must be Valid (Valid HELO)
Most email servers and anti-spam tools will not allow mails to be received unless the above protocol is in place. This practice does not supply enough information to safely identify the server and responsible party, if a problem email is received. And almost every mail server offers this capability. This is a simple rule which just insists that the HELO (or EHLO) is sent with every email connection and it is properly formatted.
In order to ensure that messages are not stopped by this check, make sure the HELO is a FQDN.The HELO string sent should in the style of:
The following bad example(s) will get rejected:
HELO 192.168.1.1 (just an IP)
If you are the one who is not receiving emails or are unable to send mail to some of your recipients, you may ask them to check if they really follow these practices.
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