OSEC

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Re: HELO/EHLO and reverse DNS

From: Peter Rabbitson (rabbitrabbit.us)
Date: Mon Jun 11 2007 - 11:53:15 CDT

mouss wrote:
> Peter Rabbitson wrote:
>> HELO (smtp_helo_name): mail.example.com
>> smtp_bind_address: 1.1.1.2
>> rDNS of 1.1.1.2: gateway2.example.com
>
> These are for sending mail, so you should set
> smtp_helo_name = gateway2.example.com
>

Due to a load balancer in the path, the outgoing connections might
originate from two different IPs. Thus I either must exempt all outgoing
smtp from the balancing, or I can simply have a HELO mismatch roughly
half of the time. It seems from the responses so far that the later is ok.