Python 运行sendgrid脚本可以手动工作，但在crontab下运行时失败

我的目标是每周使用

sendgrid

python包向多个涉众发送一个通过R脚本创建的pdf文件。手动运行R脚本和python邮件脚本时，邮件和附件会成功发送。但当我在cron作业下运行它们时，邮件无法发送

创建的pdf文件是

test.pdf

R脚本的位置是

/home/username/script.R

/home/username/run.py

python脚本的位置是

/home/username/script.R

/home/username/run.py

run.py

的内容如下

import base64
import os
import json
from sendgrid import SendGridAPIClient
from sendgrid.helpers.mail import (
  Mail, Attachment, FileContent, FileName,
  FileType, Disposition, ContentId)
from sendgrid.helpers.mail import Mail

message = Mail(
  from_email='from_email@gmail.com',
  to_emails=['to_email1@gmail.com','to_email_2@gmail.com','to_email_3@gmail.com','to_email_4@gmail.com'],
  subject='Mail',
  html_content='<strong>Please find attached</strong>')
file_path = 'test.pdf'
with open(file_path, 'rb') as f:
  data = f.read()
f.close()
encoded = base64.b64encode(data).decode()
attachment = Attachment()
attachment.file_content = FileContent(encoded)
attachment.file_type = FileType('application/pdf')
attachment.file_name = FileName('test_filename.pdf')
attachment.disposition = Disposition('attachment')
attachment.content_id = ContentId('Example Content ID')
message.attachment = attachment
try:
  sendgrid_client = SendGridAPIClient(os.environ.get('SENDGRID_API_KEY'))
  response = sendgrid_client.send(message)
  print(response.status_code)
  print(response.body)
  print(response.headers)
except Exception as e:
  print(e.message)

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

使用

grepcron/var/log/syslog

查看cron日志时，我看到以下消息

CRON[27260]: (username) MAIL (mailed 1 byte of output but got status 0x0001 from MTA#012)

Python脚本在手动条件下运行良好，但在cron上自动运行时失败。我已经按照

sendgrid

python包完成了必要的API验证。关于

crontab

，是否有我遗漏的重要设置？ 操作系统如下

import base64
import os
import json
from sendgrid import SendGridAPIClient
from sendgrid.helpers.mail import (
  Mail, Attachment, FileContent, FileName,
  FileType, Disposition, ContentId)
from sendgrid.helpers.mail import Mail

message = Mail(
  from_email='from_email@gmail.com',
  to_emails=['to_email1@gmail.com','to_email_2@gmail.com','to_email_3@gmail.com','to_email_4@gmail.com'],
  subject='Mail',
  html_content='<strong>Please find attached</strong>')
file_path = 'test.pdf'
with open(file_path, 'rb') as f:
  data = f.read()
f.close()
encoded = base64.b64encode(data).decode()
attachment = Attachment()
attachment.file_content = FileContent(encoded)
attachment.file_type = FileType('application/pdf')
attachment.file_name = FileName('test_filename.pdf')
attachment.disposition = Disposition('attachment')
attachment.content_id = ContentId('Example Content ID')
message.attachment = attachment
try:
  sendgrid_client = SendGridAPIClient(os.environ.get('SENDGRID_API_KEY'))
  response = sendgrid_client.send(message)
  print(response.status_code)
  print(response.body)
  print(response.headers)
except Exception as e:
  print(e.message)

Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

---

提前谢谢

您好，您的问题解决了吗？因为我目前正面临同样的问题，但使用python时：（您好，您是否设法解决了您的问题？因为我目前正面临同样的问题，但使用python时：(