Cannot parse address list header

## Description

Email parser issue - "Cannot parse address list header".

Full log:
```
error forwarding message letters.EmailParser.Parse: cannot parse headers: letters.parsers.ParseHeaders: cannot parse From header: letters.parsers.parseAddressListHeader: cannot parse address list header "=?UTF-8?B?aaabbbcccdddeee==?= <user@example.com>": mail: expected comma
```

