Hi Mark, On 04/06/2011 02:58 PM, Mark Anderson wrote: > Do you have any hints about how I could figure out why gmime doesn't > like this To: list? > > To: One Big Happy <OneBigHappy@amd.com>, dist.Happy Group > <dist.HappyGroup@amd.com> I may be way off, but I wonder if it's seeing "dist.Happy" and confusing it for an email address (or at least a domain) rather than the display name for the email address. Maybe display names of the form xxx.yyy need quotes? Best, Aaron