There are many misconceptions about using HTML e-mail and whether its use causes delays in transmission or blocking by spam filters. (realtormag.realtor.org)
Also, the content of e-mail messages is what triggers spam filters, and not the format in which it is sent. (realtormag.realtor.org)
The technology prevents the automated calls from ringing through by identifying suspicious phone numbers or calls, similar to how email spam filters catch unwanted emails. (wbng.com)