Closed ScottPeterJohnson closed 5 years ago
Protonmail seems to be using a large pool of sending IPs and clients. I've observed EHLO names mail-40136.protonmail.ch and mail-40133.protonmail.ch but it's unclear how many they have. Might be best to whitelist the whole protonmail.ch domain.
Protonmail seems to be using a large pool of sending IPs and clients. I've observed EHLO names mail-40136.protonmail.ch and mail-40133.protonmail.ch but it's unclear how many they have. Might be best to whitelist the whole protonmail.ch domain.