The size of a message is determined by the SMTP server not Thunderbird. The rejection also has the same source. So if something has changed ask your provider if they have changed some of their limits. You might also consider using one of the filelink providers so your mail simply does not contain attachments.

If you don't like the ones offered by default there are other here https://addons.mozilla.org/en-US/thunderbird/search/?q=filelink&appver=31.0

Hi, thx for your reply. No limits have been changed by the provider. I'm sending email over 7 mb using another email versus the same provider, of course, and there are no problem I'm in trouble with thunderbird from last version change....before it was working well..

Matteo

Hi, thx for your reply. No limits have been changed by the provider. I'm sending email over 7 mb using another email versus the same provider, of course, and there are no problem I'm in trouble with thunderbird from last version change....before it was working well..

Matteo

I will make this simple.

You appear to be under some misapprehension that the size of a message was at some time based on the unencoded size of the attachment. It never has been and never will be.

When Thunderbird sends a message it is sent to the server who decides what size it is and if it exceeds the size limit. The exceeds limit has nothing at all to do with Thunderbird, it is merely Thunderbird reporting back an error raised by the server.

Hi. Thanks in advance for your help. It seems i'm resolving the problem. You'r right of cource. may be my provider is missing something and he have somewere a configuration problem ... Thanks again Matteo