SMTP Error 101

What causes this error and solutions

SuprSend provides APIs and components for you to create notification workflows that drive collaboration & actions from your users - ensuring higher product adoption.

TABLE OF CONTENTS

SMTP Error 101 occurs when there is a configuration issue with your SMTP settings. This error is commonly associated with Google SMTP and is often triggered by invalid SSL or TLS configurations.

What's Causing This SMTP Error 101:

The SMTP 101 error may be caused by:

  • Misconfigured port.
  • Invalid SMTP host server.
  • Invalid SMTP IP address.
  • Invalid use of SSL or TLS.

However, it is noteworthy that this error frequently occurs with Google SMTP due to issues related to SSL or TLS configurations.

How SMTP Error 101 Manifests in Different Environments:

SMTP Error 101 in phpmailer:

  1. Case 1: "SMTP Error 101 - Misconfigured port in phpmailer."
  2. Case 2: "SMTP Error 101 - Invalid SMTP host server in phpmailer."
  3. Case 3: "SMTP Error 101 - Invalid SMTP IP address in phpmailer."
  4. Case 4: "SMTP Error 101 - Invalid SSL or TLS usage in phpmailer."

SMTP Error 101 in Jenkins:

  1. Case 1: "SMTP Error 101 - Misconfigured port in Jenkins."
  2. Case 2: "SMTP Error 101 - Invalid SMTP host server in Jenkins."
  3. Case 3: "SMTP Error 101 - Invalid SMTP IP address in Jenkins."
  4. Case 4: "SMTP Error 101 - Invalid SSL or TLS usage in Jenkins."

How to Resolve SMTP Error 101 - Step-by-Step Solution:

To resolve SMTP Error 101, follow these steps:

  1. Review your configurations: Double-check your SMTP settings and ensure they align with the configurations provided in the SMTP server's documentation.
  2. Check SSL or TLS settings: Verify that SSL or TLS configurations are accurate and match the requirements of your SMTP server.
  3. Google SMTP-specific solution: If using Google SMTP, enable "Less Secure Sign-In Technology" for your Google account and consider implementing the following configurations to address the error.

By carefully examining and correcting these configurations, you can effectively resolve SMTP Error 101 in both phpmailer and Jenkins environments.

Written by:
Sanjeev Kumar
Engineering, SuprSend

More to explore

Implement a powerful stack for your notifications

By clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. View our Privacy Policy for more information.