Avast 10.3 blocks Thunderbird email sending

Error: 
Thunderbird is unable to send e-mails, because Avast antivirus blocks sending process.

 "Sending of Message Failed, Unable to open the temporary file /tmp/nsmail.tmp, Check your 'Temporary Directory' Setting."


Solution:
Go to Settings => Active Protection => File System Shield Customize link => Exclusions and add *nsemail.html

Source: Avast forum

Error message when you try to send or to receive email in Outlook 2010 or Outlook 2013: 0x8004010F: Outlook data file cannot be accessed.

Error message when you try to send or to receive email in Outlook 2010 or Outlook 2013:
"0x8004010F: Outlook data file cannot be accessed"

Set up again the profile with correct settings.
Set as default.
You must delete demaged profile (email account, e.g.: IMAP).
After that, emails from "Outbox" folder will be sent out automatically.

Source: Microsoft