Hi, 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 As an alternative disabling session tickets seems to help: # ========================================================================== # service type private unpriv chroot wakeup maxproc command + args # (yes) (yes) (yes) (never) (100) # ========================================================================== submission inet n - n - - smtpd ... -o tls_ssl_options=NO_TICKET Mozilla Thunderbird is not affected but some VPN-Clients (Cisco AnyConnect, ...) seem to have issues as well. Best regards Gerald
