Latest Release: 3.20.0 / 4.2.0 (News), on 20 November 2023 
Introduced in version 3.18.0 / 4.0.0
With the introduction of OAuth2 support, the APOP option (use_apop_auth) has been swallowed into a combobox and renamed
See commit a9f154883f9af4cc39c74d595c3e05056338e22b (and 9e346e79923edcfef95565c70a930aec1e47161d).
The value of config_version should be set to 3 in following files:
Introduced in version 3.17.0
receive_at_get_all in accountrc file now only controls whether the account should be checked when user clicks on 'Get all' button. Previously, it also controlled whether the account should be included in periodic automatic checking.
From now on, automatic checking is controlled by new options, autochk_use_default, autochk_use_custom and autochk_interval.
See commit df5a92776.
In file accountrc, lines with abovementioned autochk_... options should be deleted in all accounts' sections.
The value of config_version should be set to 2 in following files:
Introduced in version 3.14.0
Value of autocheck_interval in clawsrc file is now in seconds instead of in minutes.
See commit bc779dcb0.
The value of autocheck_interval in clawsrc file should be converted from seconds to minutes - divided by 60 (rounded to an integer value if necessary).
The value of config_version should be set to 1 in following files:
Not used in any released version.
protocol numbering in accountrc file has changed after removing obsolete APOP and RPOP protocol types.
All account types except POP3 have their protocol setting decreased by two, e.g. protocol for IMAP4 accounts is now 1 instead of 3.
See commit 358e811.
The value of each protocol option in accountrc file should be increased by two, except if the actual value is 1.
The value of config_version should be set to 0 in following files:
