firewalls

Why Do Firewalls Block Marketing Emails?

Firewalls may block marketing emails for several reasons:
IP Blacklisting: If your sending IP is blacklisted, firewalls will block emails originating from it.
Content Filters: Emails containing certain keywords or phrases can trigger content filters, causing the email to be blocked.
High Bounce Rates: A high number of bounced emails can indicate to firewalls that your emails are spam.
Sender Reputation: Poor sender reputation can result in your emails being blocked by firewalls.

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