Understanding error messages (sending mail)

[eurynmous]

I've been having a little trouble setting up my yahoo email account on my phone.

The specific problem that I am having is that I can receive incoming mail but I can not send. This includes pictures and text. I have tried both POP3 and IMAP4 with same results. I've even tried to reply from a message to ensure that the address was entered correctly. Here are some of the errors I've been getting.

"Invalid message recipients" Your message "test" was not sent and has been moved to the drafts folder.

and

"The message(s) could not be sent. Check that you are network coverage and that your account information is correct. Then try sending again."

If anyone has any information that might be helpful, then I would appreciate it. Thank you for your time.