| Reverse DNS vs SMTP Auth [message #128666] |
Mon, 28 March 2016 21:38  |
j.a.duke
Messages: 239
Registered: October 2006
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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?
Thanks.
Cheers,
Jon
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