Some of emails not allowed svg files in emails find below possibilities.

SVG file in image tag src find below

AOL Web – YES
Outlook 2013 – NO
Outlook.com – YES
Yahoo! – YES
Mail (OSX) – YES
Mail (iOS) – YES
Gmail – NO
Gmail (iOS) – NO
Gmail (Android) – YES
Android – NO

For more information about SVG file in emails please find https://css-tricks.com/a-guide-on-svg-support-in-email/