@Eltolargo said in Auto-ban outbound email filtering?:
@BBigford said in Auto-ban outbound email filtering?:
As far as going through SendGrid, the recipient sees it comes from SendGrid, but the reverse lookup in the header does show the single public IP that they are using now. Things look a lot better now, but still a little work to do
Do you have the Barracuda doing rate limit per user to 500 per hour or less? When I setup Barracuda devices I make sure that is select and to get notification on high queues. You might want to also have them look into setting up monitoring for the barracuda as when there is many messages to be scanned they tend to lock up and constant firmware updates or patches (Although support is always good).
Setup an Mxtoolbox account to monitor their IP addresses on blacklists. Also make sure they use their cloud barracuda spam filter as well for incoming email.
Yep, done all that and a bit more with SendGrid. I've set a rate limit on their users, MxToolbox is monitoring their IP addresses, and also monitoring the Barracuda for abusers who have had devices compromised internally, so their accounts will be disabled until further review.