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Ask them to fix their site. Give them a few months. Get them on the PlainTextOffenders list if they won't fix their site. [1]

[1] - https://github.com/plaintextoffenders/plaintextoffenders

I'd avoid those sites and ensure passwords are unique (using something like 1Password). If you want, you could also send the maintainers a few links on best practice.

Send to plain text offenders:

https://plaintextoffenders.com/about/

Reset password. Hope they don’t mail the password again

Ask HN: Websites emailing passwords in plain text – anything to do?