Suggest an alternative to

mail-io

A lightweight SMTP server that can receive and relay mails and is highly customizable

Why do you think that https://github.com/libp2p/js-libp2p-switch is a good alternative to mail-io

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with mail-io. Optional.

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