Sarah,
Have you tested the email addresses directly from an email client? Meaning
not group.io, but a normal account somewhere. Usually when I see a 550,
there is a wrong char in the address somewhere.
-Ken Cameron, Member JMRI Dev Team
www.jmri.org
www.fingerlakeslivesteamers.org
www.cnymod.org
www.syracusemodelrr.org
Ken Cameron