g.nantista wrote:
content_filter = smtp:external.server.fqdn:25
*) "content_filter" is used for content-based anti-spam/virus, are you sure your external content filter work with this?
*) Port 25 is used by standard SMTP service, are you sure your content filter use this port?
*) Just curious, what external content filter do you use? Does it provide user manual or similar doc?