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Sending email via '163 SMTP Mail Sender' tool gets error 'Failed to send email: [Errno 101] Network is unreachable' #18278

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opened 2026-02-21 19:45:42 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 19:45:42 -05:00
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Originally created by @mm9379 on GitHub (Sep 26, 2025).

Self Checks

  • I have read the Contributing Guide and Language Policy.
  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report, otherwise it will be closed.
  • 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：）
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.8.1

Cloud or Self Hosted

Self Hosted (Source)

Steps to reproduce

Hi Dify team,

I am encountering an issue while using the Dify tool ‘163 SMTP Mail Sender’ to send emails. I created a flow to retrieve information from a Jira ticket, then tried to send that information to my email account. It always returns the error: ‘Failed to send email: [Errno 101] Network is unreachable.’

Here are the steps to reproduce the issue:

  1. Register a 163 email account.
  2. Enable the IMAP/SMTP settings for the email account, rember the Authorization Code
  3. Select the ‘163 SMTP Mail Sender’ tool and enter the ‘Email username,’ ‘Authorization Code,’ ‘Recipient mailbox,’ ‘Subject,’ and ‘Content.’
  4. Run the flow to get the information from Jira and send information by email to another account

✔️ Expected Behavior

The Jira information has been successfully retrieved, the email should be sent successfully to my other email account

❌ Actual Behavior

It always returns the error: ‘Failed to send email: [Errno 101] Network is unreachable.’

Image
Originally created by @mm9379 on GitHub (Sep 26, 2025). ### Self Checks - [x] I have read the [Contributing Guide](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) and [Language Policy](https://github.com/langgenius/dify/issues/1542). - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report, otherwise it will be closed. - [x] 【中文用户 & Non English User】请使用英语提交，否则会被关闭 ：） - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.8.1 ### Cloud or Self Hosted Self Hosted (Source) ### Steps to reproduce Hi Dify team, I am encountering an issue while using the Dify tool ‘163 SMTP Mail Sender’ to send emails. I created a flow to retrieve information from a Jira ticket, then tried to send that information to my email account. It always returns the error: ‘Failed to send email: [Errno 101] Network is unreachable.’ Here are the steps to reproduce the issue: 1. Register a 163 email account. 2. Enable the IMAP/SMTP settings for the email account, rember the Authorization Code 3. Select the ‘163 SMTP Mail Sender’ tool and enter the ‘Email username,’ ‘Authorization Code,’ ‘Recipient mailbox,’ ‘Subject,’ and ‘Content.’ 4. Run the flow to get the information from Jira and send information by email to another account ### ✔️ Expected Behavior The Jira information has been successfully retrieved, the email should be sent successfully to my other email account ### ❌ Actual Behavior It always returns the error: ‘Failed to send email: [Errno 101] Network is unreachable.’ <img width="1700" height="930" alt="Image" src="https://github.com/user-attachments/assets/7c1dd4b5-9615-4fc8-bfa7-b58e7d19719f" />
yindo added the 🐞 bug label 2026-02-21 19:45:42 -05:00
yindo closed this issue 2026-02-21 19:45:42 -05:00
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Reference: langgenius/dify#18278
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