mail-source-ignore-errors

mail-source-ignore-errors is a variable defined in `mail-source.el'.
Its value is

nil

Documentation:
*Ignore errors when querying mail sources.
If nil, the user will be prompted when an error occurs. If non-nil,
the error will be ignored.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.