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Postfix: The Definitive Guide by Kyle D. Dent

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Name

verp_delimiter_filter

Possible values:

characters

Default:

-=+

VERP is a technique used with mailing lists to handle bounced messages. It combines the list owner address and original recipient address with a special delimiter character. The verp_delimiter_filter parameter specifies which characters Postfix accepts as VERP delimiter characters.

Example:

verp_delimiter_filter = -=+

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