python send mail timeout: smtplib.SMTPDataError: (451, b'Error: queue file write error')

When using smtplib to send emails with large attachments, an error will be reported

smtplib.SMTPDataError: (451, b'Error: queue file write error')

Basically two questions:

1. Send timeout

2. The file is too large

 

 

For question 1

set timeout   class smtplib.SMTP ( host='' ,  port=0 ,  local_hostname=None , [ timeout , ] source_address=None ) ¶

And I use smtplib.STMP_SSL is exactly the same

 

For question 2

 

Just compress the file, preferably below 50M.

Finally, there is a note, if you are a .xlsx file, it is wrong to open it after decompression

It is recommended to directly generate the .xls file and then compress it.

Or after unzipping, rename .xlsx to .xls 

 

 

Finally, successfully sent! ! !