Linux FTP client that can keep remote folder in sync with

[Sam Varshavchik]

gene heskett writes:

> On 5/16/25 10:17, Sam Varshavchik wrote:
>> Colin Law writes:
>>
>>> On Fri, 16 May 2025 at 12:54, Sam Varshavchik <mrsam at courier-mta.com> wrote:
>>> >
>>> > Sure, you can change it. They're not the only hosting provider on this
>>> > planet.
>>> >
>>>
>>> Not if you are just a contractor doing some else's bidding.  All you
>>> can do is advise.  If the OP is a contractor then I advise getting a
>>> signed acknowledgement that they have received the advice and chosen
>>> to disregard it.
>>
>> No need to go that far. A simple Email, with a DSN, should be sufficient to  
>> cover one's track. To improve one's CYA factor, encourage a response of some  
>> kind, i.e. by asking "Hey, this is bad, here's why, should we look for a new  
>> hosting provider?". Any reply to that also gets archived, and will be  
>> sufficient to cover one's liability. Even if there's no reply, a DSN from  
>> the organization's mail server should be sufficient for CYA purposes.
>>
> Please clarify, we all know what CYA is, but  what is this "DSN"?

Delivery Status Notification. The nerdspeak for a return receipt.

https://datatracker.ietf.org/doc/html/rfc3461

Expecting that someone would ask, I sent my previous message with a return  
receipt requested, or a DSN. Within a few seconds it came back. Skipping the  
boilerplate, its human-readable part included, in part:

<ubuntu-users at lists.ubuntu.com>:
     lists.ubuntu.com [185.125.189.65]:
 >>> DATA
 <<< 250 OK id=1uFvsE-0000yR-G7

Together with the timestamp this documents when my list message was sent,  
and the IP address it was delivered to, and even the mail server's response.

Your mail software needs to request a DSN, the exact knobs to turn is  
specific to the mail software.
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