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Hi, I am using SMTP for sending mails. I am using Mozilla Thunderbird and I faced this problem after sending around 40 mails.
How to avoid this?

This might be about your SMTP server blocking the requests because of too many emails sent too fast, you need to know what are the limits and change your automation as needed.

  1. Please check the properties once , Whether all configuration things are set right.
  2. Check the limit of requests that can be processed at a time.

After every stipulated transactions , re-login the application if any or give a delay of few seconds and check

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