Addressing Emai

I wanted to send a return email to the sender, and to the "undisclosed recipients" to which the original email was sent,.
I use Outlook, which will send the return to the original sender, but does not recognize Undisclosed Recipients.
Without each additional address is there a way to send my email?.

 

'Undisclosed recipients' indicates that the sender marked those addresses as 'Bcc' (BLIND copies) and not 'Cc', so you can only reply to the named sender of the email, and no one else that they also sent it to, ie you cannot reply to any of the 'undisclosed recipients'.

 

Thanks for insight on what and how of Undisclosed Recipient.
I think that explains how I am getting deluged with email supporting a presidential candidate, that is also full of addresses of folks I do not know. I am looking for a way to stop getting all of this, and figured maybe sending Undisclosed Recipients a STOP-sending-me-this-already message might be a way.
Likely it's an easy way to send multiple addressee's the same message if list is subscriber restricted.
Glad I inquired, most likely John Smith269, 270, 271, ad infinitum don't care about messages to me they did not send

 

It is the original sender you need to tell to not send any more mail (or simply mark it as JUNK/SPAM) but you are misunderstanding the 'undisclosed recipients' - they are people like you getting this mail and even if you could, you should not be trying to email them.

 

People like me?
Don't remember asking to get on that list, or get their email.
But thanks anyway for tip on marking that mail. Did not know that.
Seems there is more than one person/group sending the stuff.

 

The named 'sender' and the email address shown is the person/organisation sending the mail to you.
If, as you said earlier, it is a political campaigning group, then simply scroll down in the full body of the email and look for a link that says UNSUBSCRIBE.