Can't Send Group eMails

[navigator2346]

Just started having problems replying to a group. Some will go thru but I get a message "Error Code 554.5.7.9" and just some of the recipients get rejected.

Watched a uTube on how to fix but couldn't understand the guy.

Running the latest version of Forefox,Win7,and using Yahoo Mail

Ideas on how to fix?

[navigator2346]

2oldman wrote:
Google has hits on that.

Been there

[2oldman]

Google has hits on that.

[delwhjr]

The error can mean you have run up against a block for administrative purposes. Some email servers will block certain incoming email for reasons they have enacted to prevent spam. Other possible cause is the address was not correct and rejected. You can fix the address but you can not get around the remote block. See if the text of the return message gives you more info as to the reason.
Most of the ones I have received were due to email blocking by the host server.