Large attachments stop sending and require intervention.
I call Thunderbird from a program to send out emails in batches. When an attachment exceeds approximately 14 MB, Thunderbird stops sending and requires manual intervention. The messages become stacked in a queue. I then must click the "Write" button for each message. I've modified the config file per a previous suggestion which makes a warning dialog disappear. However, Thunderbird still won't automatically send messages with attachments beyond approximately 14 MB. Is there a way to circumvent this behavior?
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Are you sure your service provider allows messages larger than 20MB? Keep in mind that encoding overhead adds about 33% to the size of an attachment, so a 15MB file results in a message of about 20MB.
The most efficient way, for both sender and recipient, to send large files is to upload the file to a (free) hosting service like OneDrive, Google Drive, Dropbox etc. and send the download link by email.
Thanks for the reply... Yes, the service provider allows the attachments since when the messages become stacked, (Send windows), I simply click each send window's "Send" button and off the message goes.
I think I will try introducing a larger delay factor between sending messages. Right now I wait 30 seconds between each message. I'm just wondering if I am overwhelming TBird even though each message receives its own thread.
Thanks again...I'll report back
If the problem is due to too many 'sends in the stack', it may work better if you Send in the Background:
http://kb.mozillazine.org/Thunderbird_3.0_-_New_Features_and_Changes#Send_in_Background