strange email activity today?

[Synthesis]

Has anyone else today come across any clients or yourselves that haven't been able to send e-mails. I have had a lot of calls from clients with different ISP's and no settings help. everything is 100%. they can receive fine, net is fine but can not send. as if it's virus activity. some enlightenment would help if anyone else knows something.

[Frozenfireside]

Erm why not call a ISP? Even if we were having the same issues we probably won't know what's going on. Just a though.

I can send and receive fine.