2020.02.14
Issue: 
Can't use an undefined value as an ARRAY reference at /var/www/cgi-bin/openwebmail/shares/mailfilter.pl line 433

Fix:
433c433
<                   if (! @{$r_attachments}) {
---
>                   if (! {$r_attachments}) {

Issue:
Can't use 'defined(%hash)' (Maybe you should just omit the defined()?) at /var/www/cgi-bin/openwebmail/.openwebmail-read.pl line 864

Fix:
864c864
<       next unless (defined %{$message{attachment}[$attnumber]});
---
>       next unless ( %{$message{attachment}[$attnumber]});
889c889
<          if ( defined %{$message{attachment}[$attnumber+1]} &&
---
>          if ( %{$message{attachment}[$attnumber+1]} &&
1511c1511
<    return 0 if (!defined @{$message{attachment}});
---
>    return 0 if (! @{$message{attachment}});