The main danger in email broadcasting is getting labeled as a spammer.
Now there’s no world-wide list of spammers that everyone agrees on.
There are dozens of “blacklists” used to a greater or lesser degree. You can check your domain using the “MX Toolbox”, put in your domain name (“thirteen05.com”), click on “MX Lookup” then click on “Blacklist Check.” (“MX” refers to how the Internet knows on what server and how, email is handled for a particular domain).
But if you aren’t on a list, that doesn’t mean you are in the clear.
Many Internet Service Providers (ISPs) such as Comcast, Verizon, will have their own internal blacklists.
It’s a pretty sure sign you are in bad with someone if your emails just don’t arrive. They don’t bounce, they just never arrive, say, at any Yahoo email address.
Getting back on their good side is another story. It isn’t necessarily quick or easy.
That’s even worse than having your account suspended by your own ISP. At least in that case you have someone to talk to.
Best not to get in trouble in the first place, by following best practices on list compilation and maintenance (see my earlier posts on this).