Hi Robert, An alias (in iCloud terminology) is simply another recognised address for your account. Apple Mail automatically allows you to choose from among your enabled aliases as the sender, but in other email software you will have to manually supply such addresses as potential From: addresses. You may use any of your aliases at any time. Therefore, tell Thunderbird that you would like to send from multiple From: addresses, or if you can control the field at time of sending, just do that.
Be aware that iCloud SMTP servers do not allow you to send mail from any address not your own. This is not normally a problem unless you are sending mail on behalf of someone else, which typical usage wouldn't result in you doing. However, you can redirect mail from Apple Mail without issue. Cheers, Sabahattin -- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to macvisionaries+unsubscr...@googlegroups.com. To post to this group, send email to macvisionaries@googlegroups.com. Visit this group at http://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
