Are there any firewalls that interfere with SMTP Authentication?
Yes. Some types of firewalls will interfere with SMTP Authentication, preventing you from being able to
- Disable scanning of SMTP traffic on their firewall.
- Or use their ISP's SMTP server to send outbound mail since most ISP's can authenticate based upon IP
address rather than username/password.
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This is a relaying denied error. You will need to turn on SMTP Authentication.