OT: Seeking opinion about reverse-DNS lookups on SMTP HELO

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
Subject: OT: Seeking opinion about reverse-DNS lookups on SMTP HELO
From: HaJo Schatz <hajo@xxxxxxxx>
Date: Tue, 14 Dec 2004 20:02:46 +0800
Reply-to: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
User-agent: Mozilla Thunderbird 1.0RC1 (X11/20041207)

To combat spam I have enabled reverse-DNS lookups of incoming SMTP connections. If the FQDN does not match the HELO-Identity, I reject the connection with a 550 Error.

I have now found that this breaks communication even with reputable (well, an international bank that is) peers. Dunno how much more mail I may have lost through this... How are you out there handling that, are you doing reverse-lookups?

--
HaJo Schatz <hajo@xxxxxxxx>
http://www.HaJo.Net

PGP-Key:  http://www.hajo.net/hajonet/keys/pgpkey_hajo.txt

Follow-Ups:
- Re: OT: Seeking opinion about reverse-DNS lookups on SMTP HELO
  - From: Alexander Dalloz
- Re: OT: Seeking opinion about reverse-DNS lookups on SMTP HELO
  - From: Scot L. Harris
- Re: OT: Seeking opinion about reverse-DNS lookups on SMTP HELO
  - From: Aleksandar Milivojevic
- Re: OT: Seeking opinion about reverse-DNS lookups on SMTP HELO
  - From: Paul Howarth

Prev by Date: Re: Moving files from ext2 to FAT32 under FC3 is VERY slow!
Next by Date: Re: Hot machine
Previous by thread: firefox on fedora 2
Next by thread: Re: OT: Seeking opinion about reverse-DNS lookups on SMTP HELO
Index(es):
- Date
- Thread

[Index of Archives] [Current Fedora Users] [Fedora Desktop] [Fedora SELinux] [Yosemite News] [Yosemite Photos] [KDE Users] [Fedora Tools] [Fedora Docs]