Re: [Fetchmail-users] ATP dynamic delivery

[<sup...@gm...>]

ATP dynamic delivery is a MS exchange concept whereby emails are delivered without attachments but preview links instead.  

The attachments are scanned off line and then the original email is sucked back and replaced by a new version of the email with the attachment - this can take quite a while.

If fetchmail gets the email before this process occurs the suck back and replacement with the attachment never happens, the "preview" link goes dead and the attachment never arrives.

It is definitely a server side issue but I can't change the server side behaviour (if you can change the server side settings then simple fix is to change the "dynamic" delivery policy with "replace" delivery policy which behaves like any normal system where the email is delivered after it is scanned).

This is not the only problem with ATP but it seems to be the biggest source of loss of attachments.

A possible tactic would be to exclude the fetching of emails containing these preview links and defer their download until the suck back and replacement process has happened.


On Friday, 28 July 2023 21:24:52 BST Matthias Andree wrote:
> Am 27.07.23 um 09:25 schrieb sup...@gm...:
> > "ATP dynamic delivery"
> 
> Whatever that means. fetchmail deals with IETF-standard protocols, and
> if on your upstream server, attachments go missing, talk to your
> provider's support. If it's a "server"-side setting on Microsoft stuff,
> same story. We can't fix server faults from the client's end.
> 
> 
> 
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