- Email contains garbled characters when opened into Horde webmail interface;
- Thunderbird, Outlook, Roundcube shows correct content of the message;
- The original mail contains free space and BOM character after URL
NOTE: BOM chracter will become visible in text editor after enabling showing all characters: it will appear as red dot.
BOM character can be used only at the beginning of the email HTML body and should not be present in another arbitrary: due to this message got corrupted. The implementation of workaround in Plesk is considers as feature for product improvement with ID PPPM-11074.
As the issue is not reproduced in Roundcube, switch webmail to use Roundcube instead.