Cannot login, sender IP blacklist

Help
1

Since the latest update I have been logged out of the Mondo app. I tried signing in again using the magic link but
the email doesn’t get through to me as the IP is blacklisted.

Client Address: 198.21.6.101 [o3.bn.sendgrid.net]
Content Classification: Blocked using RBL: sip.invaluement.local

EDIT: Andddd, the third email got through - never mind!

2

Those RBL blacklists really piss me off as I have had problems with them before. Ended up doing business with a different company when I could not get thru to who I wanted.