Allows filtering email by the TO value(s) as well

src-ui/src/app/components/common/edit-dialog/mail-rule-edit-dialog/mail-rule-edit-dialog.component.html

@@ -18,6 +18,7 @@
       <div class="col">
         <p class="small" i18n>Paperless will only process mails that match <em>all</em> of the filters specified below.</p>
         <app-input-text i18n-title title="Filter from" formControlName="filter_from" [error]="error?.filter_from"></app-input-text>
+        <app-input-text i18n-title title="Filter to" formControlName="filter_to" [error]="error?.filter_to"></app-input-text>
         <app-input-text i18n-title title="Filter subject" formControlName="filter_subject" [error]="error?.filter_subject"></app-input-text>
         <app-input-text i18n-title title="Filter body" formControlName="filter_body" [error]="error?.filter_body"></app-input-text>
         <app-input-text i18n-title title="Filter attachment filename" formControlName="filter_attachment_filename" i18n-hint hint="Only consume documents which entirely match this filename if specified. Wildcards such as *.pdf or *invoice* are allowed. Case insensitive." [error]="error?.filter_attachment_filename"></app-input-text>

src-ui/src/app/components/common/edit-dialog/mail-rule-edit-dialog/mail-rule-edit-dialog.component.ts

@@ -149,6 +149,7 @@ export class MailRuleEditDialogComponent extends EditDialogComponent<PaperlessMa
       account: new FormControl(null),
       folder: new FormControl('INBOX'),
       filter_from: new FormControl(null),
+      filter_to: new FormControl(null),
       filter_subject: new FormControl(null),
       filter_body: new FormControl(null),
       filter_attachment_filename: new FormControl(null),