Open Relay test — gmail.com FAIL
- Server accepted external RCPT — appears to be an OPEN RELAY!
Fix:Lock down your MTA: require authentication before allowing RCPT to non-local domains.
S › 220-sh4-rbx1.serverdnszone.com ESMTP Exim 4.99.4 #2 Sat, 06 Jun 2026 00:39:50 +0300 220-We do not authorize the use of this system to transport unsolicited, 220 and/or bulk e-mail. C › EHLO mxtoolcheck.com S › 250-sh4-rbx1.serverdnszone.com Hello mxtoolcheck.com [46.105.244.181] 250-SIZE 52428800 250-LIMITS MAILMAX=1000 RCPTMAX=50000 250-8BITMIME 250-PIPELINING 250-PIPECONNECT 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP C › MAIL FROM:<[email protected]> S › 250 OK C › RCPT TO:<[email protected]> S › 250 Accepted C › RSET S › 250 Reset OK C › QUIT S › 221 sh4-rbx1.serverdnszone.com closing connection
