Meta ignores RFC 2920; ZuckMail can't send mail to servers running OpenSMTPD
a year ago
- #Meta
- #OpenSMTPd
- #SMTP
- Mikolaj Kucharski reports that verification emails from WhatsApp (Meta) are not arriving to his OpenSMTPd server on OpenBSD 7.7/amd64.
- The logs show an error: '500 5.5.1 Invalid command: Pipelining not supported', indicating that Meta's email server is attempting to use SMTP pipelining, which OpenSMTPd does not support.
- Omar Polo confirms that OpenSMTPd does not advertise pipelining support and suggests this is a bug on Meta's side.