Email Client Image Blocking
Email
image blocking is now almost universal, with many email clients automatically
blocking any external image.
This
means that many users won't see your graphically-rich email as intended
and, if you track open rates, you won't know if the recipient has
read your message.
Here
are my 3 top tips:
1. Get
whitelisted
If you
are added to the recipients address book, your images will automatically
be displayed in most email clients.
2. Send
text & HTML emails together
If your
email programme automatically sends a text version with your HTML
email (ie. multi-part MIME format), recipients that can't handle HTML
will still get a readable message.
3. Focus
on response rate (click-throughs) & conversions, not opens.
With
image blocking rapidly becoming the default setting, open rates are
unreliable. If you want to measure the success of your email campaigns,
focus on the bottom line.
| Email
Image Blocking |
AOL
6.0+
|
Gmail
|
Hotmail
|
Outlook
2000/XP
|
Outlook
2003
|
Outlook
Express
|
Outlook
Express
+SP2
|
Yahoo
|
| External
images blocked by default |
Yes
|
Yes
|
No
|
No
|
Yes
|
No
|
Yes
|
No
|
| User-controlled
image-blocking |
Yes
|
No
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
| User
can click a link to enable email images |
Yes
|
Yes
|
Yes
|
No
|
Yes
|
N/A
|
Yes
|
No
|
| Images
enabled if sender in address book |
Yes
|
No
|
Yes
|
Yes
|
Yes
|
Yes
|
Yes
|
No
|
| Alt
tags displayed when images disabled |
No
|
Yes
|
No
|
No
|
No
|
N/A
|
No
|
No
|
[SP2
= Microsoft Service Pack 2 for Windows XP]