v0.10

New features

• Mailgun, SparkPost: Support multiple from addresses, as a comma-separated from_email string. (Not a list of strings, like the recipient fields.) RFC-5322 allows multiple from email addresses, and these two ESPs support it. Though as a practical matter, multiple from emails are either ignored or treated as a spam signal by receiving mail handlers. (See #60.)

Other changes

• Fix crash sending forwarded email messages as attachments. (See #59.)
• Mailgun: Fix webhook crash on bounces from some receiving mail handlers. (See #62.)
• Improve recipient-parsing error messages and consistency with Django's SMTP backend. In particular, Django (and now Anymail) allows multiple, comma-separated email addresses in a single recipient string.