Encoding issues during e-mail sending [5.2.1-RC1]

I've found several problems in code, that is sending e-mails in In-Portal:

1. when a colon (:) is present in recipient name, then e-mail isn't sent at all, because colon breaks header parsing on SMTP server
2. when a quote (") is present in the attached filename, then attachment is either named wrong in recipient e-mail client or can't be downloaded at all

No wonder, that this wasn't discovered for a long time, because both cases are indeed very rare.

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