Maybe I'm in the kiddie league, but I've been using my ISP's webmail services
that are available through Cpanel under my own domain names for several years
without incident until recently, whereupon my main Verizon email account
started to bounce emails from my domains' webmail accounts that contained
links, even after I spent a couple of days fighting with Verizon, trying to
get myself whitelisted ... all to no avail.
What I do now to "fool" that paranoid Verizon spam filter is to remove the
"http://" from each link, replace it with "..." and expect my correspondents
to fill in the blanks.
I have not used the emailing capabilities available on any of my computers
ever since I looked in my address folder and found only destinations that I
had never used ... in a MS computer, of course ... thirty years ago.