When specifying multiple recipients in the to field they have to be separated by commas. When separating with spaces only the message is only sent to the first recipient, the others are silently discarded. IMO it would be best if all (for a mail address) illegal characters are treated as separators, not only commas
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This is not safely possible because of e.g. comments. If you still think it is possible after studying the relevant RFCs please let us know.
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Please reread the summary!
I'm talking about messages not beeing sent to some recipients while the user thinks it is sent to all recipients! Not fixing this is UNEXCEPTABLE!
The message has to be sent to all recipients specified or an appropriate error message has to be issued.
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Go for it! :-)