Error sending emails through outlook

[Guest]

[MargeVP]

I have an external mail provider, but I control everything in my network through Endian Fireall 2.4.1 release.

Until Sunday August 25, my mail service in the company worked properly, but on Monday 26 started having problems sending mail through Outlook, all mail accounts that send attachments over 80 KB are left in tray output.

I tried to connect directly to my internet provider router, and mail out doesn't have problem, I have restored several firewall settings backups without success.

What has been damaged in my endian firewall?

[vaohama]

Please try to change smtp to your IP of EFW
Authentication > none