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Is there any free api or paid one to check if an email exist?
I want to ask if there is free tools or paid one to reliably check if an email is exist, I'm hosting this https://github.com/reacherhq/check-if-email-exists before but I don't know but the docker container keep getting shut down and it's unreliable.

Comments
You could ask an LLM, that's a task it should be able to handle, to code you a small API with that feature.
Creating a Python script that checks via SMTP verify should be easy enough. No need for docker or somesuch.
If you are using Amazon SES, they provide this:
https://docs.aws.amazon.com/ses/latest/dg/email-validation.html
Also there is our beloved nerd @eva2000 with marvelous https://github.com/centminmod/validate-emails