Yes. Some types of firewalls will interfere with SMTP Authentication, preventing you from being able to

send mail.

- 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.


Was this answer helpful?
Also Read
What problems are occurring if I can't send mail via your SMTP server? (Views: 514)
MS Outlook has been working fine lately, but today I am having problems. Why? (Views: 481)
How long will it be before my email will work? (Views: 469)
How can I test to see if I can reach your POP server? (Views: 494)
When I click the Test Account Settings button in MS Outlook XP, an error indicates that I cannot reach the (Views: 509)