mail/postfix: Add support for configuring sender_canonical_maps #1406
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This PR adds support for configuring postfix sender_canonical_maps with regexp expressions. This is needed when relaying mail over an external SMTP server that only allows sending with specific sender addresses. (e.g. only the address that was also used for authenticating with the external relay). This PR is based on the Address/virtual configuration in the postfix plugin and works mostly the same.