220 mailsubzur1001.protonmail.ch ESMTP Postfix| Server | smtp.protonmail.ch |
|---|---|
| Port | 587 |
| STARTTLS | Supported |
| TLS (implicit) | No |
| AUTH mechanisms | PLAIN LOGIN |
| Country | CH |
| AS Number | AS6233 |
| Health | UP |
| Active | Yes |
| Verified At | Never |
| Last Check | 2026-06-23 06:47:03 |