Hi, > > There's nothing my users or the legitimate users sending email to my > users > > can do about it, and it's always reactionary - it's not like I can > explain > > to them that if their users use one particular Google IP that they could > > have incoming mail blocked. > > That's not true. People can stop using gmail. If it were anybody but > gmail that had this degree of outbound spam, they'd just be blocked. >
Yes, of course, that's one solution. The problem is that it's a B2C business, so there are a lot of legitimate gmail/hotmail users. This also means there isn't much regularity to outgoing mail to subtract points. It's usually just one-offs where users check on ordering or ask general product questions. This also doesn't include the businesses using Workspace, which would most likely share the same IPs.
