shellrider
Who are “they” telling you about expiring certificates, and why can’t they tell you which certificates they mean? 😉
If someone asks me about “expiring certificates” I ask back: “which ones? Your birth certificate? My drivers license?”
No, its about Lets Encrypt certificates for https. They last only 3 months, but if everyhting is configured according to the docs, mailcow auto renews the certificates.