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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?
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.