problems sending emails

Question

I am having problems with my outbound email. Internal email delivery isn't affected. 
 I am aware of knowledge base article 134082. 
 Our direct deposit emails are not going out which is a problem. 
 I can see my email from our payroll to my gmail address has failed under the mail spool. 
 I click on the Subject and download the message then forwarded it to my gmail account. 
 While in the queue, I check the box to retry. 
 I see the email delivered to my gmail inbox. 
 
 Any suggestions on how to get the rest of my failed messages to go out?

B.R.O. · Accepted Answer

the firewall rule I had for my VPN traffic was specified to match source for any zone and destination for any zone. 
 This was causing some mis-alignment in the backend of the firewall as this policy was placed above the system generated firewall rule to be referenced for my email traffic. Support made a change in the backend to change the reference firewall ID for your email traffic to the system generated one as well as turn off this custom firewall rule. 
 Support was able to verify after our changes that email are now flowing as expected. 
 the issue is now resolved.