Bounce non-user email replies

[Manasa2850]

Fixes #3322 (<=== Add issue number here)

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[gitpod-io]

[codecov]

Codecov Report

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@@           Coverage Diff           @@
##             main    #9126   +/-   ##
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[Manasa2850]

@jywarren I've used regex to get the email ID and sending an email using ActionMailer. Is this fine?
Also, what should be the sender's email ID... Do we have a public lab email ID that I need to put there?
Thank you!

[gitpod-io]

[Manasa2850]

@jywarren regarding sending back an email in case of other errors, I checked the rescue Exception code in script/mailman_server. But it seems like we commented it out since it caused the site to slowdown. Should we have it back or keep it as it is for now?
Thank you!

[jywarren]

Hi, unfortunately the rescue is bad for memory management it seems, so let's keep it. Thank you @Manasa2850 and apologies for the slow reply!

[gitpod-io]

[codeclimate]

Code Climate has analyzed commit 6f5eb32 and detected 0 issues on this pull request.

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[jywarren]

Awesome work, thank you!!!