I've a strange feeling that I've mentioned this problem before and have forgotten the answer, so if I have please forgive me. Mac Mini running Mountain Lion; it seems that yahoo, my email providers, have yet again 'improved' themselves and as a result made sending an email a ponderous slog. I would therefore like to use Mail, which is fine for sending an email or for replying to one; but not for forwarding one to a group. When I enter the first letter of a group's name it offers me only the addresses of individuals beginning with that letter, not groups beginning with it. I've clicked several times on 'synchronise with yahoo' but to no avail. It is obviously synchronised with yahoo or it wouldn't be able to give me any addresses at all, but why does it not recognise the groups I've created in yahoo?
I think Mail will only synchronise the email with Yahoo i.e. I don't think Contacts (which Mail would use for its groups) would sync at all with Yahoo. You could try exporting your contacts from Yahoo and importing them into Contacts. I doubt it would retain the group structure so you may have to set them up again.
Thanks Mick, I've just discovered how to do it courtesy of google. Open Address Book, which, much to my surprise, contains all my contacts, click on File>New Group, give it a name & press Enter, drag members from the huge list on the right into the new group, double click on the group name, et voila!
When you click New Message in Mail you should see an icon of a person on the menu bar. If you click this it will take you to your Address Book/Contacts from where you can choose your group or individual contact.
Eric Jervis 