The AUR's package notification email includes a URI to the relevant commit that solves a certain issue. These are broken in mail clients due to being line-feeded. Below is just a recent example of one:

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Subject: AUR Comment for profile-sync-daemon
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= = = base64 decoding of the email body = = =

graysky [1] added the following comment to profile-sync-daemon [2]:

Bump to v6.17-1

Changelog: use more obvious comments in .psd.conf per #151.
Commit: https://github.com/graysky2/profile-sync-
daemon/compare/v6.16...v6.17

If you no longer wish to receive notifications about this package,
please go to the package page [2] and select "Disable notifications".

[1] https://aur.archlinux.org/account/graysky/
[2] https://aur.archlinux.org/pkgbase/profile-sync-daemon/

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A working link to the commit would look like:
Commit: https://github.com/graysky2/profile-sync-daemon/compare/v6.16...v6.17