1. Deliverability. Difficulty of getting messages delivered through different internet service providers (ISPs), corporate firewalls and webmail systems.
2. Renderability. Difficulty of displaying the creative as intended within the in-box of different email reading systems.
3. Email response decay. Email recipients are most responsive when they first subscribe to an email. It is difficult to keep them engaged.
4. Communications preferences. Recipients will have different preferences for email offers, content and frequency which affect engagement and response. These have to be managed through communications preferences.
5. Resource intensive. Although email offers great opportunities for targeting, personalisation and more frequent communications, additional people and technology resources are required to deliver these.
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