Blocked sent messages

[Sue201]

On my mobile all of my sent messages have a blocked sign next to them.  I know that some of them went through.  It says that the message was from a sender in my blocked list (when I open them) but surely I’m the sender. I don’t understand this but after receiving the spoof emails wonder if someone has access to them 

[Gondola]

If your blocked list on your phone includes your own email address then remove that address from the blocked list.

Did you mark the spoofed emails as spam? That's added your email address to the blocked list.