Serialize simple messages directly as multipart/alternative. #243
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Some spam detectors like Rspamd have rules which detect messages that are multipart/mixed yet have no non-textual part (for example the rule CTYPE_MIXED_BOGUS in Rspamd). This increases the spam score of messages created with Flask-Mail unnecessarily.
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Some spam detectors like Rspamd have rules which detect messages that are multipart/mixed yet have no non-textual part (for example the rule CTYPE_MIXED_BOGUS in Rspamd). This increases the spam score of messages created with Flask-Mail unnecessarily.
This PR makes the message serialization simpler in case it can be.