Introduced batch-wise processing of a POP3 account's messages through a configuration property in pop3.properties: com.openexchange.pop3.pop3BlockSize.

The default is 100. The following lines are added to pop3.properties:

# Specify the number of messages (positive integer!) which are allowed to be processed at once.
# Default is 100.
# Zero or negative value is defaulted to 100.
com.openexchange.pop3.pop3BlockSize=100