If you implement SPF / DKIM / DMARC / ADSP, force your customers to relay their mail through something you control, and show them you are serious about stopping the spam they may work with you then. Otherwise, they just assume you're a spam house.
- Working with Spamhaus Bryan Tong
- Re: Working with Spamhaus Stephen Satchell
- Re: Working with Spamhaus Private Sender via NANOG
- Re: Working with Spamhaus Michael O Holstein
- Re: Working with Spamhaus Michael O Holstein
- Re: Working with Spamhaus Randy Bush
- Re: Working with Spamhaus Valdis . Kletnieks
- Re: Working with Spamha... Jon Lewis
- Re: Working with Spamhaus Jaren Angerbauer
- Re: Working with Spamhaus Ricky Beam
- Re: Working with Spamha... Suresh Ramasubramanian
- Re: Working with Spamhaus William Herrin
- Re: Working with Spamhaus Randy via NANOG