block emails without any recipient, what would be the
best way to do it ?
thanks,
Karel
wherever emails are stored. This is easy to set
up in Linux with LUKS/cryptsetup.
Karel
> On 2016-11-02 13:27, Wietse Venema wrote:
>
> Karel:
>>> On 2016-11-02 11:36, Wietse Venema wrote:
>>>> NOQUEUE: reject: RCPT from unknown[x.x.x.x]: 450 4.7.1 Client host
>>>> rejected: cannot find your hostname, [x.x.x.x]
>>>
>>> Not
> On 2016-11-02 11:36, Wietse Venema wrote:
>> NOQUEUE: reject: RCPT from unknown[x.x.x.x]: 450 4.7.1 Client host
>> rejected: cannot find your hostname, [x.x.x.x]
>
> Note that this is a 450 status, because the name server did not reply.
> A proper SMTP client will therefore try to deliver the
hostname, [x.x.x.x]
I know that unreachable nameservers are a problem of its own, and that
it should not happen. But still, is there anything I can do in Postfix
to mitigate this, should it happen again?
thanks,
Karel
> On 2016-06-08 17:59, Phil Stracchino wrote:
>
> This may not work for you, but I reject all incoming mail connections
> directly from Windows hosts at my firewall. They are overwhelmingly
> likely to be botnet spam zombies. If it's a legitimate mailserver, it
> will fall back through my backup
ogs on paper, and then use OCR to scan them back.
Does this process have to be so complicated ? Is there no easier way to
block offending IP addresses using iptables ?
thanks,
Karel
> On 2016-02-14 18:34, Bill Cole wrote:
>
>> are there any legitimate (non-spam) senders, that would be blocked by
>> reject_unknown_client_hostname ?
>
> Do you consider Microsoft's Office365 to be "legitimate?"
>
> They send substantial non-spam, yet many of their output IPs have PTR
> addresse
> On 2016-02-10 20:39, Noel Jones wrote:
>
> This particular client has no reverse DNS hostname. Most sites find
> it safe to use reject_unknown_reverse_client_hostname to reject such
> clients. This similar to restrictions at many big mail providers and
> is a much safer alternative than reject_u
> On 2015-10-29 10:11, hyndavirap...@bel.co.in wrote:
>
> Every 3000 Sheets of paper costs us a tree.. Save trees... Conserve
> Trees. Don't print this email or any Files unless you really need to
this list might be the least appropriate place to spread such agenda.
After all, a MTA is alrea
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