Bug in Base64MailCodec

[sinxwal]

In several mail accounts i have noticed this error with message body decoding:
Exception has occurred. FormatException (FormatException: Invalid character (at character 999) ...JuYWxDbGFzcyB0ZCwKLkV4dGVybmFsQ2xhc3 MgZGl2IHsKbGluZS1oZWlnaHQ6IDEwMCU7C...

Error occurs in messages with base64 encoded boundary, see the space symbol here 3 M.

Here is the current decodeData impl (Base64MailCodec decodeData method).
var cleaned = part.replaceAll('\r\n', '');

My workaround is to rewrite it like this:
var cleaned = part.replaceAll(RegExp('\r\n| '), '');

Example message:

[sinxwal]

@robert-virkus Maybe we can override Base64MailCodec with a custom implementation?