why cant I reply to certain recipients by reply or forwarding

[Guest]

my emails keep coming back to me saying" service administrator unable to
deliver", how can I reply to these emails without issues as mentioned?

 

[Lanwench [MVP - Exchange]]

In

my emails keep coming back to me saying" service administrator unable
to deliver", how can I reply to these emails without issues as
mentioned?

Hi -

When you post in here, always include your version, SP level, and mode (if
applicable) of Outlook - you can find this information in Help | About. Also
include the type of mail account(s) you use and any other pertinent details.

Be sure to put a consise summary of your question in the subject line, and
the full details in the body of your post.

 

[Vanguard]

my emails keep coming back to me saying" service administrator unable to
deliver", how can I reply to these emails without issues as mentioned?

Because those senders used an invalid e-mail address in the Reply-To header.
That means you are attempting to reply to an e-mail address that doesn't
exist. Copy the e-mail address in the From header and replace that in your
reply's To field, and tell the recipient that they need to fix their
Reply-To header.