If you send an email to multiple recipients, it saves two messages in tmp/mails, but they have the same ID. Mails viewer treats each of these as separate emails even though they have the same ID and it makes it look like the email got sent multiple times.
Multiple email files in tmp/mails that have the same ID should show up in the mail previewer as a single email with multiple recipients.
If you send an email to multiple recipients, it saves two messages in tmp/mails, but they have the same ID. Mails viewer treats each of these as separate emails even though they have the same ID and it makes it look like the email got sent multiple times.
Multiple email files in tmp/mails that have the same ID should show up in the mail previewer as a single email with multiple recipients.