Why is image to text ratio so important?
Part of the bi-product of this was that content filters stopped liking image heavy emails. Any business server, which will use Spam Assassin, requires:
When using an ESP, normally only 2 images are required because the ESP will drop a tracking image in the footer. This also means that it is impossible to send HTML emails with no images, due to the tracking image in the footer used to track the opens. Also the 400 character limit is inconsistent.
Most consumer ISPs, eg: Hotmail, Yahoo & Gmail; have their own filters but because they have evolved in the same environment for the same reason as Spam Assassin, they tend to agree on all counts. With the exception of reputation: If you don’t get negative responses to your emails, they tend to be far more lax in their content requirements.
Subsequently it is a good idea to ensure you have enough text in the message to avoid any filter’s ambiguities.
- A maximum of 40% image coverage
- A minimum 60% text coverage
- More than 3 images in the page - if any at all.
- Not all images touching
- At least 400 characters of text
When using an ESP, normally only 2 images are required because the ESP will drop a tracking image in the footer. This also means that it is impossible to send HTML emails with no images, due to the tracking image in the footer used to track the opens. Also the 400 character limit is inconsistent.
Most consumer ISPs, eg: Hotmail, Yahoo & Gmail; have their own filters but because they have evolved in the same environment for the same reason as Spam Assassin, they tend to agree on all counts. With the exception of reputation: If you don’t get negative responses to your emails, they tend to be far more lax in their content requirements.
Subsequently it is a good idea to ensure you have enough text in the message to avoid any filter’s ambiguities.
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