Sin City Presents Magazine July 2015 Volume 2 Issue 7 - Page 29


From The Desk Of The

Sin City Webmaster

5. Use Spam Checkers before Sending Your Emails

Before sending emails out to your entire list, it’s worth the time to utilize a spam checking service. offers a free downloadable tool for Windows that uses SpamAssassin to check. If you prefer to avoid downloading any software, you can send email to the service and they will also check a few other items important to email deliverability. Alternatively, uses a form-based solution to test your emails.

6. Get Off Blacklists

If your email server is on a blacklist, it becomes extremely difficult to reliably send email, especially to new people on your lists.

The first step is to check if your email server is on a blacklist, following are a few free services

Free Email Blacklist Lookup

Email Blacklist Check

Spam Database Lookup

If you find that you are on a blacklist, you will need to follow up with the website that has added you to their blacklist. That information is provided by the tools listed above.

7. Maintain a Good Text to Image Ratio

It is usually best to not include images at all; however, if you must include images, here are some tips

Do not send any image-only emails

I suggest that for every graphic, include at least two lines of text

Optimize your images the best you can

Use well-formed HTML for email

8. Avoid Spam Traps

Spam traps are email addresses that are flagged by ISPs as being no longer used by a human, so it then stands to reason that there could have been no opt-in. To avoid including a spam trap email in your mailing list, use an opt-in process and do not buy lists from email brokers.

9. Avoid Large Attachments and Certain Attachment Types

In general, .jpg, .gif, .png and .pdf attachments are safe to send, provided you include some content in the email as well. However, executable attachments such as .exe, .zip, .swf, etc. should be avoided entirely. Generally, you should not send attachments to people on your list that are not expecting them.

If you need to email a large attachment or an attachment type that usually can be flagged as spam or trigger virus scanners, we recommend a service such as If the attachment contains sensitive data, you may consider using your company’s secure FTP server.

10. Make Sure Your DKIM, SPF, Sender-ID, and Domain Keys Are Set Up Properly

You will want to make sure your email server supports these protocols (DKIM, SPF, Sender-ID, and Domain Keys) and that they are properly implemented.

This alphabet soup helps ISPs determine the authenticity of your email from a technical perspective. To make sure yours are set up properly try using’s checking service.

If you want to dig deeper, here are the definitions:

DomainKeys Identified Mail (DKIM)

Sender Policy Framework (SPF)


Domain Keys

Bonus Tip: Use an Email Delivery Service