I have Watchguard firewall installed, QMailtoaster in DMZ and all my users (PC/Notebook) are using SMTP port w/ authentication but they, especially Notebook users (Sales and Manager up) never complain when they used their email outside office network
But I'll have some test, to make sure. Thanks for the info, Jake

Jake Vickers wrote:
To those that may run into the issue:
The Watchguard firewall (hardware firewall) features a SMTP/POP proxy service that can cause you issues. You will receive mail normally but when your clients try and send email on port 25 (from outside the firewall/DMZ) they will receive errors in Outlook saying:



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