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Hi Albrecht:

On 06/09/2017 12:54:48 PM Fri, Albrecht Dreß wrote:
Hi all,

I am currently implementing the "automatic queue transmission after timeout" 
feature which has been discussed recently here.

This is simple if there is only /one/ smtp server.  But it gets difficult if 
the user has more than one server, probably with different responsiveness  E.g. 
I send to one ISP via a local Postfix (fast and always reachable, let Postfix 
deal with any network issues), and to an other ISP directly (sometimes slow and 
unreachable).

Of course only /one/ simultaneous connection shall be open to a specific 
server.  But while the send process to one (possibly slow) server is running in 
a separate thread, there is IMO no good reason why the send process to an other 
(faster?) server should be delayed until the slow one is ready.

The difficult part is how this should be displayed to the user.  The present 
implementation has a dialogue which receives the progress information via IPC.  
This is not feasible if multiple threads would feed their information into it, 
as each one would overwrite the information from the others.

I think the only usable solution would be either a separate dialogue for each 
SMTP server, or a single dialogue which dynamically adds and removes a section 
consisting of a label and a progress bar for each server.

A different situation occurs if the transmission is initiated in background by 
the timeout handler.  IMO, in this case no dialogue should be shown.  Instead, 
I think a notification (of level LIBBALSA_INFORMATION_MESSAGE) when the 
transmission is started and when it has been finished, either with success or 
with an error, should be shown.

What do you think?

So the thread-per-server model would be used both for user-initiated sends (such 
as File => Send queued mail) and for timer-initiated sends, but the progress 
information would be presented differently, is that right? I like the outline, 
especially the single dialog with progress indicators dynamically added and 
removed. Smooth transitions would be really cool…

Best,

Peter
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