As I understand it, Gmail's undo button doesn't actually 'unsend' the
message, because there's no unsending feature in SMTP.

What it does instead is to simply DELAY sending the message for 5-10
seconds. If, during that time, the user clicks the 'undo' button, then
it takes the message out of the send queue and never sends it.

I assume you could do this with `qmail` but you'd have to patch
`qmail`'s queue handling so that it wouldn't send any messages it
discovered in the queue until their creation date was at least 5-10
seconds in the past.

And then you'd need to implement something that could pull a specific
message out of the send queue, and expose that functionality via an API,
and add interface elements to your MUA to call the API.

It would be a lot of work to implement, and I've not seen anything to
suggest that it's currently supported.

Angus



Eric Broch wrote on 10/12/24 2:39 PM:
> Not that I'm aware of. Maybe someone knows something I don't.
> 
> On 10/12/2024 12:36 PM, Tahnan Al Anas wrote:
>> Yes, like zoho, gmail provide undo button within 5-10 sec
>>
>> On Sun, 13 Oct 2024, 12:27 am Eric Broch, <ebr...@whitehorsetc.com> wrote:
>>
>>     Do you mean that after a qmail SMTP server has sent an email to
>>     another server this process could somehow be reversed ?
>>
>>     On 10/12/2024 12:21 PM, Tahnan Al Anas wrote:
>>>
>>>     Hi Eric,
>>>
>>>     Do qmail have recall a sent email option?
>>>
>>>     --
>>>     --
>>>
>>>     Best Regards
>>>     Muhammad Tahnan Al Anas
>>>
>>>
>>>     On Sat, Oct 12, 2024 at 8:01 PM Eric Broch
>>>     <ebr...@whitehorsetc.com> wrote:
>>>
>>>         What are you migrating from? Courier? Dovecot?
>>>
>>>         On 10/12/2024 7:34 AM, Eric Broch wrote:
>>>>
>>>>         What are you migrating from?
>>>>
>>>>         On 10/12/2024 7:27 AM, Tony White wrote:
>>>>>         Hi Eric,
>>>>>           Did all of that but the imap folders are all wrong for
>>>>>         Dovecot.
>>>>>
>>>>>         regards
>>>>>         Tony White
>>>>>         Across Technology
>>>>>         4a Birmingham Rd, 
>>>>>         Mount Evelyn, 
>>>>>         Victoria 3796
>>>>>         Mob 0481 362 743
>>>>>         acrosstechnology.com.au <http://acrosstechnology.com.au>
>>>>>         ALL CALLS ARE RECORDED
>>>>>         On 13/10/24 00:24, Eric Broch wrote:
>>>>>>         http://wiki.qmailtoaster.org/index.php?title=EL7_to_EL_8_or_9
>>>>>>
>>>>>>         On 10/12/2024 6:41 AM, Tony White wrote:
>>>>>>>         Hi Folks,
>>>>>>>           I am stuck. I have migrated to Rocky 8 and kept the
>>>>>>>         original Maildir
>>>>>>>         and not moved to the new database many-domains yet.
>>>>>>>           Can someone please tell me how I move GB's of Maildir
>>>>>>>         to Dovecot?
>>>>>>>         Appreciate any help here. I cannot see anything in the
>>>>>>>         docs to help.
>>>>>>>
>>>>>>>         TIA :)
>>>>>>>
>>>>>>>         -- 
>>>>>>>         regards
>>>>>>>         Tony White
>>>>>>
>>>>>>         
>>>>>> ---------------------------------------------------------------------
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>>>>>>
>>>>>

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