Sybille Lodder wrote:
When I send emails they are not arriving, (but they are placed in
postbox out)
Incomming mail is going well.

If you mean they're shown as having been delivered but they're not being
received, it may be your antivirus software IF you have e-mail scanning
turned on. AV apps for some reason don't always report a delivery failure
and since they took the message responsibility, they told your mail client
it was delivered, when in fact it wasn't. Norton likes to do that with
outgoing email scans.

Try turning off email scanning if you have it turned on.

Pop`