minor #16468 [Mailer] add Amazon SES to list of transports that support metadata (kbond)

This PR was merged into the 6.1 branch.

Discussion
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[Mailer] add Amazon SES to list of transports that support metadata

Closes #16467.

Commits
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17d2736 [Mailer] add Amazon SES to list of transports that support metadata

Author: javiereguiluz

mailer.rst

@@ -1266,6 +1266,10 @@ The following transports only support tags:
 
 * OhMySMTP
 
+The following transports only support metadata:
+
+* Amazon SES
+
 Draft Emails
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