Hello,
I am not sure if this is intended behavior but I noticed that Phabricator emails are not properly formatted - they aren't HTML valid and lack the plain text alternative part.
One example of such email message
```
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<table>
<tr>
<td style="">bbrdaric-test added a project: Some project.
</td>
</tr>
</table>
<br>
<div><strong>TASK DETAIL</strong>
<div><a href="https://phabricator.local/T123" rel="noreferrer">https://phabricator.local/T123</a>
</div>
</div>
<br>
<div><strong>EMAIL PREFERENCES</strong>
<div><a href="https://phabricator.local/settings/panel/emailpreferences/" rel="noreferrer">https://phabricator.local/settings/panel/emailpreferences/</a>
</div>
</div>
<br>
<div><strong>To: </strong>bbrdaric-test
<br>
</div>
```
Because of this, they run into our SpamAssassin Rules and eventually get marked as spam.
```
X-Spam-Checker-Version: SpamAssassin
X-Spam-Level: ******
X-Spam-Status: No, score=6.3 required=10.0 tests=ALL_TRUSTED,BAYES_99,
BAYES_999,EXIM_ESV_DEFER,EXIM_HSV_DEFER,HTML_MESSAGE,HTML_MIME_NO_HTML_TAG,
MIME_HTML_ONLY,RP_MATCHES_RCVD,URIBL_BLOCKED autolearn=no
```
https://wiki.apache.org/spamassassin/Rules/MIME_HTML_ONLY
https://wiki.apache.org/spamassassin/Rules/HTML_MIME_NO_HTML_TAG
I tried to find config option for sending plain-text emails, but as I can see, Phabricator supports sending only HTML emails?
Version Information
```
phabricator 8cb3706fe80fdd0fa416c114eda9363c7226c315 (Tue, Apr 25) (branched from 03d0e3fdbc890ca9670e8caaf20aa39ebd61d04b on origin)
arcanist 146693307f607ffa93dfb99599f1989d5b27e03d (Fri, Apr 21)
phutil 6fe33623cda69b7814a0767866400e09f4eadf3a (Thu, Apr 13)
```