Cinder is email on cinderfmail.com infrastructure, built for the long, steady burn of everyday business correspondence.
Cinder is designed to still be quietly working a year in, not just impressive on day one.
Consistent routing that doesn't degrade as your account ages.
Generous limits so old mail doesn't force constant cleanup.
Protection is on from the first message, with no setup step.
Your rate at signup stays your rate, year after year.
"Three years in, it's exactly as reliable as day one."
"Fixed pricing meant our budget never had to think about it again."
Yes, your rate at signup is locked for as long as you remain a customer.
Indefinitely, on every plan, with no forced archival.