A packed To field can also be inconvenient for recipients. Reading a message with a long To field on an iPhone, for instance, is a bother when you have the Details field visible. You must either hide this field (and remember to display it again later) or scroll, and scroll, and scroll some more to finally get to the meat of the message.

To avoid this breach of etiquette in the future, use your e-mail client's BCC (Blind Carbon Copy) field--which isn't visible to recipients. Put one recipient in the To field (use your own e-mail address here to keep all other addresses private) and then put the other addresses in a BCC field. That way, everyone gets the message but no one can see the other recipients' addresses.

Dear Mac Manners,

I understand the advantage of using the BCC field, but I don't know how to find it in my e-mail client. Can you help?

Confused in Connecticut