Fix: multiple To/Cc addresses, RFC 5322 compliant #89
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According to RFC 5322, multiple e-mail addresses should by separated by comma instead of semicolon.
3.4 RFC 5322 Address Specification
mailbox-list = (mailbox *("," mailbox)) / obs-mbox-listUsing semicolon with e.g. Exim mail server leads to "550: header syntax error" message.
With commas, sending to multiple addresses works as expected.