Every email gets flagged as “opened,” so the flag is meaningless, and recipients can see the images without triggering a tracker.
The company also ran a mail filter called Baracuda or something similar that followed links in emails to see if they were malicious.
I was quite annoyed when I was called to do the mandatory training as "I" had clicked a link (on an email I hadn't seen) and more so when told I had no other recourse than to sit through it.
I resigned shortly afterwards.
An automated system processing emails isn’t going to be fetching images or rendering attached SVGs.
I am trying to read as less _online_ as possible nowadays. I essentially have dovecot in my crontab, and read it off roundcube. It's been working great, RoundCube is dead simple to setup and use, the UI and search are very fast.
I’m not sure if Exchange Online doesn’t scan them or something, but I landed up making a rule which blocks all emails with either .svg or .htm(l) attachments and to notify me when blocked.
Happens a couple of times per month for the our small company, no false positives yet.
Best of luck to you on your blog. I would suggest you also add a "welcome to my blog" post where you give a little background about why you're writing the blog and what kinds of content readers can hope to see in the future. There's no denying that you have little content, so you might as well make it clear to readers _why_ that is. Plus, it sets them up to be interested to see what's coming next.