TLS Negotiation failed

Posts: 1
Joined: Fri Apr 01, 2016 6:18 am

TLS Negotiation failed

Postby ibrahimkalhasan » Fri Apr 01, 2016 6:32 am

Hello all

When I send to my domain from Gmail I get this error

Delivery to the following recipient failed permanently:

Technical details of permanent failure:

TLS Negotiation failed: 
generic::failed_precondition: starttls error (0): protocol error

----- Original message -----

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20120113;
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20130820;

X-Gm-Message-State: AD7BkJLlNYVxC3THaEdwwHE5v8Z5KsizfvNijtFvfR7GOfwbR6UzlYBkLolC6Sfb20Gul0zaDjxxMewdR76+Qw==

Can someone help me to fix this issue

Site Admin
Posts: 8773
Joined: Mon Mar 22, 2004 4:44 am
Location: Melbourne, Victoria, Australia

Re: TLS Negotiation failed

Postby MailEnable-Ian » Thu Apr 07, 2016 1:05 am


You have most likely enabled inbound TLS within the MailEnable SMTP properties window under the "General" tab which is failing. Try and disable the TLS option for SMTP and then try to send from Gmail again to your server and Gmail will fall back to use non TLS. TLS requires that you set a valid SSL certificate within MailEnable do be used for the TLS connection. Have you done this?

Ian Margarone
MailEnable Support

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