We can no longer send mail

[#1]

We have no problem receiving it. No settings have been changed. Was working fine yesterday evening. Have tried from all the machines on our network. I don't see anything in Service Status referring to this. Is anyone else experiencing problems?

[#2]

No problem here.  Worth a call to CS and see if they can help.

[#3]

Haven't changed your member centre password at all? AFAIR this is also the password for your postmaster mailbox.

[#4]

Problem solved after a reboot of my router!