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Postfix Documentation
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VERP support in the Postfix QMQP server

When the Postfix QMQP server receives mail with an envelope sender address of the form:

[email protected]@[]

Postfix generates sender addresses "[email protected]", using "-=" as the VERP delimiters because qmail/ezmlm expect this.

More generally, a sender address of "prefix@origin-@[]" requests VERP style delivery with sender addresses of the form "prefixuser=domain@origin". However, Postfix allows only VERP delimiters that are specified with the verp_delimiter_filter parameter. In particular, the "=" delimiter is required for qmail compatibility (see the qmail addresses(5) manual page for details).
Postfix Documentation
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