SMTP — gmail.com:25 FAIL
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220-sh4-rbx1.serverdnszone.com ESMTP Exim 4.99.4 #2 Sat, 06 Jun 2026 00:38:46 +0300
STARTTLS
Yes
Elapsed
290.4 ms
- Server did not respond with a 220 banner.
- STARTTLS advertised but negotiation failed.
Fix:Enable STARTTLS on your MTA with a valid TLS certificate.
EHLO extensions
sh4-rbx1.serverdnszone.com Hello mxtoolcheck.com [46.105.244.181] SIZE 52428800 LIMITS MAILMAX=1000 RCPTMAX=50000 8BITMIME PIPELINING PIPECONNECT AUTH PLAIN LOGIN STARTTLS HELP
Show SMTP transcript
S › 220-sh4-rbx1.serverdnszone.com ESMTP Exim 4.99.4 #2 Sat, 06 Jun 2026 00:38:46 +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 › STARTTLS S › 220 TLS go ahead I › STARTTLS negotiation FAILED C › QUIT S ›
