Line 169 – Results in Notification Email being Triggered As Spam

On Line 169 of mail-on-update.php you append the following text to the outgoing email:

---
If this plugin is useful to you, you can support it with Flattr.
https://flattr.com/thing/2511359/WordPress-Mail-On-Update-WordPress-Plugins

For some time (a # of versions of this plugin) i couldnt figure out why no longer had been receiving notifications. It turned out that it was the line above being added to the bottom of the email that was triggering my server and indicating it was spam:

SMTP error from remote mail server after end of data:
550 High probability of spam

When i removed the line i can now receive notifications correctly.

Could u update your plugin so it follows the WordPress rules and does not include this remote URL automatically, but instead gives users the option to include it?

Thanks