upgrade mail gem
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theworkerant commented
Heroku was nice to say:
You are receiving this notification because you have at least one app running a version of the Mail gem with a known memory regression. Upgrading can reduce memory footprint in a basic application by up to 36%.
http://www.schneems.com/2014/11/07/i-ram-what-i-ram.html
To fix, please upgrade to mail 2.6.3 above.