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Mail server gives an error:
5.7.0 Failed to authorize the sender 1517494895-2z6Ljv0H5M-LZjiFfek 1517494895-cnw9fN8Bpu-LVqeibT9
Check the message and try again (translate from Russian).

Thunderbird Portable 38.7.1

What is it?

Questa recensione riguarda una versione precedente (0.9.5) del componente aggiuntivo. 

Hi, the error message you get is a server error. You have to check with your mail provider for the exact error. There can be many reasons for this error, but probably you've sent too many messages in a short period of time and you have to wait a bit to be able to send messages again. You can try to prevent this from happening, by setting the number of concurrent SMTP-connections to a lower value, for instance to 1 in Mail Redirect's Options.