Message could not be sent due to a connection problem?

I just started having problems sending email replies & new messages. I get an error message "message could not be sent due to connection problem". I have checked my connection to the internet and all is good.

Have been sending e-mails since have had computer and to this person for same periode.This time, wrote e-mail, attached photos, and sent. Got message could not be sent. Have done this many times and this is the first time have had this problem?

Whenever I try to forward anything this message keeps popping up and not allowing me to forward anything. Sometimes it doesn't allow me to forward an e mail. Have I touched a wrong key somewhere?

I have repeatedly tried to send a message, but it was never sent to to a connection problem, I don't know how to fix it. Help? Thank you!

i have a problem lately my internet connection is sucks when i browse web for some time it works fine then it says internet connection test failed and on modem the internet and dsl lights go out and come back after like 5-10 minutes then it would work...

right well, i just got my laptop back from the shop where they was repairing it (battery was faulty) and when i got it back i couldnt go on the internet, before i sent it to get repaired it worked fine.. the message im getting is "This computer...

right well, i just got my laptop back from the shop where they was repairing it (battery was faulty) and when i got it back i couldnt go on the internet, before i sent it to get repaired it worked fine.. the message im getting is "This computer...

I have tried to send e-mail to two different contacts today but I get this message. At the same time mail to other contacts does go through. I have retried several times but I get the same result. Do any of you know a) what causes this and b) what I...