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How to minimize chances of one's domain being falsely blacklisted? Put your org name and preferred methods of contacts wherever one might look. Setting up a web server for all domains you are sending mail from is reasonable. Setting up a server with unrelated content ("parked") is a red flag. If upon registering the business with local authorities ...


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I solved this problem by using: using transport_maps: main.cf file: transport_maps = hash:/etc/postfix/transport_maps transport_maps file: # recipient domains that have rejected the main MX domain1.com relay[your-spare.smtp.com]:25 domain2.com relay[your-spare.smtp.com]:25 using smtp_fallback_relay: main.cf file: smtp_fallback_relay: [your-spare.smtp....


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