Scenario:
1. Activated VPN connection that restricted SMTP.
2. Tried to send a mail which got stuck in the outbox.
3. Disabled VPN.
4. Sent a couple of mails only to notice that they were still in the outbox.
"Send mail from the queue", restarting Kontact and/or akonadi, restarting KDE didn't help. Just as in comment 16, I had to manually edit the dispatcher config file and restart akonadi.
Same here on KMail 4.7.2.
Scenario:
1. Activated VPN connection that restricted SMTP.
2. Tried to send a mail which got stuck in the outbox.
3. Disabled VPN.
4. Sent a couple of mails only to notice that they were still in the outbox.
"Send mail from the queue", restarting Kontact and/or akonadi, restarting KDE didn't help. Just as in comment 16, I had to manually edit the dispatcher config file and restart akonadi.