> just wanted to let you know that Outlook users might run into problems > submitting mails after Microsoft's latest Windows update. > > Oct 15 14:49:42 mx1 postfix/submission/smtpd[25067]: connect from <redacted> > Oct 15 14:49:42 mx1 postfix/submission/smtpd[25067]: SSL_accept error from > <redacted>: lost connection > Oct 15 14:49:42 mx1 postfix/submission/smtpd[25067]: lost connection after > STARTTLS from <redacted> > > This occurs on submission port 587 (STARTTLS) and smtps port 465 (TLS). > > Since deinstalling the update no submission errors have occured: > > - Update KB5018418 on Windows 11 (verified) > - Update KB5018410 on Windows 10
This issue is resolved by update KB5018496 for Windows 11 22H2 x64: https://support.microsoft.com/en-us/topic/october-25-2022-kb5018496-os-build-22621-755-preview-64040bea-1e02-4b6d-bad1-b036200c2cb3 October 25, 2022—KB5018496 (OS Build 22621.755) Preview [...] It addresses an issue that might affect some types of Secure Sockets Layer (SSL) and Transport Layer Security (TLS) connections. These connections might have handshake failures. For developers, the affected connections are likely to send multiple frames followed by a partial frame with a size of less than 5 bytes within a single input buffer. If the connection fails, your app will receive the error, “SEC_E_ILLEGAL_MESSAGE”. Best regards Gerald
