postfix/cleanup[2829]: warning: regexp map /etc/postfix/body_checks, line 10: no closing regexp delimiter "[": skipping this rule I have used the content filter like this: filter: body filter Regexp. pattern : ^sellerhcg^ data : blank Action : Reject Active : Yes please correct me, where I am wrong.
Try e.g. this regex: /sellerhcg/ ^ can not be used to enclose a regex as it is used to define the beginning of a matching pattern.