GFI Software

Welcome to the GFI Software community forum! For support please open a ticket from

Home » GFI User Forums » Kerio Connect » Reverse DNS vs SMTP Auth
Reverse DNS vs SMTP Auth [message #128666] Mon, 28 March 2016 21:38 Go to next message
j.a.duke is currently offline  j.a.duke
Messages: 239
Registered: October 2006
In the SMTP Server Relay Control settings, I have checked:

Allow relay only for Users authenticated through SMTP for outgoing mail

In the SMTP Server Security Options tab, I have checked in Additional Options:

Block if client's IP address has no reverse DNS entry (PTR)

Occasionally, a problem occurs when people are traveling and trying to connect from various hotel or other public networks, that the lack of the PTR record causes problems (unable to send due to lack of reverse dns type error).

Generally, I have laptops and other systems outside the office configured to use port 465 with SSL and authentication for SMTP sending. Should that be updated to port 587 with SSL and authentication?


Re: Reverse DNS vs SMTP Auth [message #128668 is a reply to message #128666] Mon, 28 March 2016 21:57 Go to previous message
Kerio/GFI Brian is currently offline  Kerio/GFI Brian
Messages: 852
Registered: March 2004
Location: California
Yes, users with authentication should always use SMTP submission service ( port 587) because it is less strict with the requirements.

Brian Carmichael
Instructional Content Architect
Previous Topic: Reset just the auto-whitelist.db?
Next Topic: Backup folder under store folder, full of zip files, can i clean?
Goto Forum:

Current Time: Thu Sep 28 10:46:58 CEST 2023

Total time taken to generate the page: 0.07350 seconds